Electromagnetism I: Master the Fundamentals of Electricity and Magnetism

Question 1

In electromagnetism, which of these is a scalar quantity?

Accepted Answer

Electric potential

Answer

Electric field

Answer

Magnetic field

Answer

Electromagnetic force

Question 2

According to Gauss's law, the total electric flux passing through any closed surface is directly proportional to:

Accepted Answer

The total charge enclosed by the surface

Answer

The electric field at the surface

Answer

The surface area

Answer

The permittivity of the material inside the surface

Question 3

According to Gauss's Law, the total electric flux through a closed surface is directly proportional to:

Accepted Answer

The total electric charge enclosed by the surface

Answer

The electric field at the surface

Answer

The area of the surface

Answer

The permittivity of the medium outside the surface

Question 4

An electron is moving perpendicular to a magnetic field. What path will the electron follow?

Accepted Answer

Circular

Answer

Straight line

Answer

Elliptical

Answer

Parabolic

Question 5

According to Gauss's law, the electric flux through a closed surface is directly proportional to which quantity?

Accepted Answer

The total charge enclosed by the surface

Answer

The surface area

Answer

The distance to the nearest charge

Answer

The surface shape

Question 6

Which characteristic is NOT a property of an electrostatic field?

Accepted Answer

Solenoidal behavior

Answer

Conservative nature

Answer

Adherence to Gauss's law

Answer

Ability to exert force on charged objects

Question 7

Gauss's law states that the net electric flux through a closed surface is directly proportional to what quantity?

Accepted Answer

The total charge enclosed by the surface

Answer

The surface area of the closed surface

Answer

The electric field strength at the surface

Answer

The material properties of the medium inside the surface

Question 8

Which property is not a characteristic of electric fields?

Accepted Answer

Electric fields store energy.

Answer

Electric fields exert forces on charged particles.

Answer

Electric fields can be represented by field lines.

Question 9

A parallel-plate capacitor has plates with an area of 0.2 square meters and a separation of 1 millimeter. The plates are connected to a 12-volt battery. Calculate the capacitance of this capacitor.

Accepted Answer

2.4 x 10^-11 Farads

Answer

4.8 x 10^-11 Farads

Answer

7.2 x 10^-11 Farads

Question 10

In electromagnetic induction, what phenomenon triggers the emergence of an electromotive force (EMF) in a conductor?

Accepted Answer

Changing magnetic flux

Answer

Changing electric field

Answer

Fluctuating current density

Answer

Varying capacitance

Question 11

An electron travels through a uniform magnetic field with a velocity perpendicular to the field. What force will the electron experience?

Accepted Answer

A force perpendicular to the magnetic field

Answer

No force

Answer

A force parallel to the magnetic field

Question 12

What property defines a material as a good electrical conductor?

Accepted Answer

Low electrical resistance

Answer

High electrical resistance

Answer

High magnetic permeability

Question 13

Define electric field intensity (E) precisely.

Accepted Answer

Force experienced by a unit positive charge at a point.

Answer

Force experienced by an electron at a point.

Answer

Energy stored in an electric field.

Answer

Potential difference between two points.

Question 14

According to Gauss's law, the net electric flux through a closed surface is proportional to:

Accepted Answer

The total charge enclosed by the surface.

Answer

The permittivity of the medium.

Answer

The potential difference between the surface and a point inside it.

Answer

The surface area of the surface.

Question 15

Identify the material with high electrical conductivity.

Accepted Answer

Copper

Answer

Rubber

Answer

Wood

Answer

Glass

Question 16

Specify the SI unit of magnetic flux density.

Accepted Answer

Tesla

Answer

Weber

Answer

Gauss

Answer

Coulomb

Question 17

Classify the magnetic material that exhibits diamagnetic properties.

Accepted Answer

Aluminum

Answer

Iron

Answer

Nickel

Answer

Copper

Question 18

State Faraday's law of induction precisely.

Accepted Answer

The induced electromotive force (EMF) in a circuit is proportional to the time rate of change of magnetic flux.

Answer

The magnetic field strength.

Answer

The current in the circuit.

Answer

The resistance of the circuit.

Question 19

Identify the primary function of a transformer.

Accepted Answer

Transfer power from one circuit to another.

Answer

Increase the voltage of an AC signal.

Answer

Decrease the frequency of an AC signal.

Answer

Convert AC to DC.

Question 20

Specify the SI unit of magnetic permeability.

Accepted Answer

Henry

Answer

Tesla

Answer

Weber

Answer

Ampere

Question 21

An electric field is defined as the region of space around a charged particle where:

Accepted Answer

An electric force can be detected

Answer

An electric potential exists

Answer

Electric energy is stored

Answer

Electric current flows

Question 22

Gauss's law for electric fields states that the total electric flux through any closed surface is proportional to:

Accepted Answer

The charge enclosed by the surface

Answer

The potential difference across the surface

Answer

The current flowing through the surface

Answer

The capacitance of the surface

Question 23

The potential difference between two points in an electric field is defined as:

Accepted Answer

The work done per unit charge in moving from one point to the other

Answer

The electric field strength between the two points

Answer

The charge difference between the two points

Answer

The distance between the two points

Question 24

Which of the following correctly describes the force between two parallel wires carrying current in the same direction?

Accepted Answer

Attractive and proportional to the square of the current

Answer

Repulsive and proportional to the current

Answer

Zero

Answer

Attractive and proportional to the current

Question 25

The unit of magnetic flux is:

Accepted Answer

Weber (Wb)

Answer

Tesla (T)

Answer

Ampere (A)

Answer

Henry (H)

Question 26

The direction of the induced current in a coil is predicted by:

Accepted Answer

Lenz's law

Answer

Ampere's law

Answer

Faraday's law

Answer

Gauss's law

Question 27

An electromagnet is a device that:

Accepted Answer

Uses an electric current to create a magnetic field

Answer

Converts electrical energy into mechanical energy

Answer

Converts mechanical energy into electrical energy

Answer

Uses a magnetic field to create an electric current

Question 28

The capacitance of a capacitor is defined as:

Accepted Answer

The ratio of charge stored to potential difference

Answer

The ratio of potential difference to charge stored

Answer

The product of charge stored and potential difference

Answer

The difference between charge stored and potential difference

Question 29

What happens to the magnetic field strength inside a solenoid when a ferromagnetic core is inserted?

Accepted Answer

Increases

Answer

Decreases

Answer

Reverses direction

Answer

Remains the same

Question 30

Define the Poynting vector and explain its significance in electromagnetic power transmission.

Accepted Answer

The Poynting vector represents the power density per unit area of electromagnetic fields, enabling analysis of energy flow and power transmission in electromagnetic systems.

Answer

The Poynting vector is primarily used to determine the direction of electromagnetic wave propagation.

Answer

The Poynting vector is a scalar quantity with no directional properties.

Answer

The Poynting vector has no practical applications in the field of electromagnetism.

Question 31

Gauss's law states that the total electric flux through a closed surface is proportional to:

Accepted Answer

The total charge enclosed by the surface

Answer

The electric field strength on the surface

Answer

The area of the surface

Question 32

Which material has the highest electrical conductivity?

Accepted Answer

Copper

Answer

Aluminium

Answer

Rubber

Question 33

Which of the following is a unit of magnetic field strength?

Accepted Answer

Tesla

Answer

Coulomb

Question 34

Faraday's law of electromagnetic induction states that:

Accepted Answer

A changing magnetic field induces an electric field

Answer

An electric current creates a magnetic field

Question 35

The magnetic permeability of a material is a measure of its:

Accepted Answer

Ability to resist magnetic fields

Answer

Ability to store magnetic energy

Question 36

A solenoid is a coil of wire that creates:

Accepted Answer

A uniform magnetic field inside the coil

Answer

A non-uniform magnetic field inside the coil

Question 37

Gauss's law states that the total electric flux through a closed surface is proportional to the:

Accepted Answer

Number of charges enclosed by the surface

Answer

Electric field strength at the surface

Answer

Area of the surface

Answer

Volume enclosed by the surface

Question 38

The magnetic force on a current-carrying wire in a magnetic field is given by:

Accepted Answer

F = IℓB

Answer

F = qvB

Answer

F = qv / B

Answer

F = Iℓ / B

Question 39

The magnetic flux through a surface is:

Accepted Answer

The number of magnetic field lines passing through the surface

Answer

The amount of magnetic field passing through the surface

Answer

The amount of magnetic energy passing through the surface

Answer

The amount of magnetic force acting on the surface

Question 40

Faraday's law of induction states that:

Accepted Answer

A changing magnetic field induces an electric field

Answer

A changing electric field induces a magnetic field

Answer

A moving charge induces a magnetic field

Answer

A moving magnet induces an electric field

Question 41

An inductor is a device used to store:

Accepted Answer

Magnetic energy

Answer

Electric energy

Answer

Mechanical energy

Answer

Thermal energy

Question 42

Which of the following is NOT a fundamental property of electric fields?

Accepted Answer

Finite range of influence

Answer

Conservativeness

Answer

Zero divergence in source-free regions

Answer

Attractive nature between opposite charges

Question 43

Gauss's law states that the net electric flux through any closed surface is:

Accepted Answer

Proportional to the net charge enclosed within the surface

Answer

Inversely proportional to the net charge enclosed within the surface

Answer

Zero if there is no net charge enclosed within the surface

Answer

Dependent on the shape and size of the closed surface

Question 44

The electric potential at a point is defined as:

Accepted Answer

The amount of work done per unit charge to bring a small test charge from infinity to that point

Answer

The electric field at that point

Answer

The force experienced by a unit positive charge at that point

Answer

The energy stored in the electric field at that point

Question 45

Which of the following is the unit of capacitance?

Accepted Answer

Farad

Answer

Coulomb

Answer

Henry

Answer

Ohm

Question 46

Electric current in a circuit is defined as the:

Accepted Answer

Rate of flow of electric charge

Answer

Amount of charge that passes through a point in a circuit

Answer

Potential difference across a resistor

Answer

Resistance of the circuit

Question 47

Which of the following devices operates based on the principle of electromagnetic induction?

Accepted Answer

Transformer

Answer

Capacitor

Answer

Resistor

Answer

Diode

Question 48

Gauss's law states that the net electric flux through any closed surface is proportional to the:

Accepted Answer

Total charge enclosed by the surface.

Answer

Permittivity of the medium.

Answer

Electric field strength.

Answer

Surface area.

Question 49

The electric potential at a point is defined as the:

Accepted Answer

Work done to bring a unit positive charge from infinity to that point.

Answer

Force experienced by a unit positive charge at that point.

Answer

Electric field strength at that point.

Question 50

A capacitor with capacitance 'C' is charged to a potential difference 'V'. The energy stored in the capacitor is:

Accepted Answer

1/2 CV^2

Answer

CV

Answer

C^2V

Answer

V^2/C

Question 51

Electric current is defined as the:

Accepted Answer

Rate of flow of charge.

Answer

Electric potential difference across a conductor.

Answer

Total charge flowing through a conductor.

Question 52

The magnetic force on a moving charged particle is:

Accepted Answer

Proportional to the product of the charge and the velocity of the particle.

Answer

Proportional only to the charge of the particle.

Answer

Proportional only to the velocity of the particle.

Question 53

The magnetic field lines around a current-carrying wire form:

Accepted Answer

Concentric circles.

Answer

Parallel lines.

Answer

Hyperbolic curves.

Answer

Radial lines.

Question 54

The magnetic flux through a surface is defined as the:

Accepted Answer

Product of the magnetic field strength and the surface area.

Answer

Force experienced by a moving charge in the surface.

Answer

Electric potential difference across the surface.

Question 55

An inductor with inductance 'L' is connected to a battery with voltage 'V'. The energy stored in the inductor is:

Accepted Answer

1/2 LI^2

Answer

L^2I

Answer

I^2/L

Answer

LI

Question 56

A parallel-plate capacitor has a capacitance of 20 μF and is connected to a battery with a voltage of 12 V. What is the energy stored in the capacitor?

Accepted Answer

144 μJ

Answer

72 μJ

Answer

288 μJ

Answer

360 μJ

Question 57

According to Gauss's law, the electric flux through a closed surface is proportional to:

Accepted Answer

The total charge enclosed by the surface

Answer

The surface area

Answer

The electric field at the surface

Answer

The permittivity of the medium

Question 58

The force between two point charges of opposite sign is:

Accepted Answer

Attractive

Answer

Repulsive

Answer

Zero

Question 59

The unit of electric potential is:

Accepted Answer

Volt

Answer

Coulomb

Answer

Ampere

Answer

Ohm

Question 60

Electromagnetic waves consist of:

Accepted Answer

Fluctuating electric and magnetic fields that propagate through space

Answer

Magnetic fields only

Answer

Electric fields only

Question 61

A current of 2 A flows through a resistor of 10 Ω. What is the voltage drop across the resistor?

Accepted Answer

20 V

Answer

10 V

Answer

40 V

Question 62

Which of the following materials is a ferromagnetic material?

Accepted Answer

Iron

Answer

Copper

Answer

Plastic

Answer

Aluminum

Question 63

What is the direction of the magnetic force on a moving positive charge through a perpendicular magnetic field?

Accepted Answer

Perpendicular to both the magnetic field and the velocity

Answer

Parallel to the velocity

Answer

Parallel to the magnetic field

Question 64

Which of the following devices operates on the principle of electromagnetic induction?

Accepted Answer

Transformer

Answer

Battery

Answer

Resistor

Answer

Capacitor