A magnetic field cannot MCQ with Answer and Explanation

Question Report Error

A magnetic field cannot

A. Change kinetic energy of a charge

B. Accelerate a charge

C. Exert force on a charge

D. Change momentum of a charge

Answer: Option A

Solution (By JKExamLibrary)

Magnetic force perpendicular to velocity, work zero, KE constant.

This question belongs to: Science Physics

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Practice More Physics Questions

Question #1 Report Error

The scientist who proposed the electromagnetic theory of light was

A. Newton

B. Huygens

C. Einstein

D. Maxwell

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Correct Answer: Option D

Explanation:
Maxwell's equations predicted EM waves, light is EM.

This question belongs to: Science Physics

Question #2 Report Error

An object weights 10 N in air, 8 N in water. The buoyant force is

A. 2 N

B. 8 N

C. 10 N

D. 18 N

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Correct Answer: Option A

Explanation:
Loss in weight = buoyant force = 10 - 8 = 2 N. Weight of displaced water = 2 N. Volume of object = mass of displaced water / density. Archimedes principle.

This question belongs to: Science Physics

Question #3 Report Error

Beats used for:

A. Instrument tuning

B. Neither

C. Sound speed measurement

D. Both

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Correct Answer: Option D

Explanation:
Beats: tune instruments (zero beat = matched frequency); measure sound speed via known frequency difference. Memory tip: 'Beats: tuning and measurement applications'. Wave phenomenon application frequently tested in competitive exams.

This question belongs to: Science Physics

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