Class 10 Practice Level 3 – Magnetic Effects of Electric Current – Set – 1

Total questions: 15

Which of the following statements is true about the Earth's magnetic field?

Topic: Magnetic Field

It remains constant at all places on the Earth's surface

It is stronger at the equator than at the poles

It reverses its direction periodically over geological timescales

It has no effect on charged particles

None

If a charged particle moves in a magnetic field, the maximum force is experienced when the angle between the velocity and magnetic field is:

Topic: Magnetic Field

0°

45°

90°

180°

None

An increase in the temperature of a current-carrying conductor results in:

Topic: Electromagnetism

An increase in the magnetic field around it

A decrease in the magnetic field around it

No change in the magnetic field around it

A reversal of the magnetic field direction

None

Which of the following changes will increase the magnetic field strength of a solenoid?

Topic: Electromagnetism

Reducing the number of turns in the coil

Decreasing the current through the coil

Using a ferromagnetic material as the core

Increasing the length of the solenoid

None

A current-carrying loop is placed in a uniform magnetic field. The net force acting on the loop is:

Topic: Force on a Current-Carrying Conductor

Zero

Equal to the product of current and magnetic field

Directly proportional to the area of the loop

Directly proportional to the square of the current

None

The force experienced by a current-carrying conductor in a magnetic field can be increased by:

Topic: Force on a Current-Carrying Conductor

Decreasing the length of the conductor

Increasing the strength of the magnetic field

Decreasing the current in the conductor

Placing the conductor parallel to the magnetic field

None

Which of the following factors does NOT affect the magnitude of the induced emf in a coil?

Topic: Electromagnetic Induction

The number of turns in the coil

The rate of change of magnetic flux

The cross-sectional area of the coil

The resistance of the coil

None

If the magnetic flux linked with a coil changes from 0.1 Wb to 0.5 Wb in 0.2 seconds, the average induced emf is:

Topic: Electromagnetic Induction

2 V

3 V

4 V

5 V

None

The magnetic field at the center of a circular loop of radius 0.1 m carrying a current of 5 A is:

Topic: Magnetic Field

$ \displaystyle 3.14\times {{10}^{{-5}}}\text {T}$

$ \displaystyle 6.28\times {{10}^{{-5}}}\text {T}$

$ \displaystyle 1.57\times {{10}^{{-5}}}\text {T}$

$ \displaystyle 7.85\times {{10}^{{-5}}}\text {T}$

None

10.

A wire carrying a current of 10 A is placed in a magnetic field of 0.5 T, the length of the wire in the magnetic field is 0.2 m. Calculate the force acting on the wire if it is perpendicular to the magnetic field?

Topic: Magnetic Field

1 N

2 N

3 N

4 N

None

11.

A solenoid with 500 turns per meter carries a current of 2 A. Calculate the magnetic field inside the solenoid.

Topic: Electromagnetism

$ \displaystyle 1.26\times {{10}^{{-2}}}\text{T}$

$ \displaystyle 2.52\times {{10}^{{-3}}}\text{T}$

$ \displaystyle 1.26\times {{10}^{{-3}}}\text{T}$

$ \displaystyle 2.52\times {{10}^{{-2}}}\text{T}$

None

12.

A 50-turn coil of wire with a cross-sectional area of 0.01 $ \displaystyle {{\text{m}}^{2}}\text{ }$ is placed in a uniform magnetic field of 0.1 T. If the coil is rotated from a position where its plane is perpendicular to the field to a position where its plane is parallel to the field in 0.1 seconds, calculate the average induced emf?

Topic: Electromagnetism

0.5 V

1.0 V

1.5 V

2.0 V

None

13.

A 2 m long wire carrying a current of 3 A is placed in a magnetic field of strength 0.05 T. Calculate the maximum force experienced by the wire?

Topic: Force on a Current-Carrying Conductor

0.15 N

0.30 N

0.45 N

0.60 N

None

14.

A rectangular loop of dimensions 0.2 m by 0.1 m is placed in a uniform magnetic field of strength 0.3 T. The loop carries a current of 4 A. Calculate the torque acting on the loop if its plane is parallel to the magnetic field?

Topic: Force on a Current-Carrying Conductor

0.024 N·m

0.048 N·m

0.072 N·m

0.096 N·m

None

15.

A coil of 100 turns with a cross-sectional area of 0.02 m2 is placed in a magnetic field that changes uniformly from 0.2 T to 0.5 T in 0.1 seconds. Calculate the induced emf?

Topic: Electromagnetic Induction

6 V

8 V

10 V

12 V

None

1 out of 15

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Class 10 Practice Level 3 – Magnetic Effects of Electric Current – Set – 1

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