Question

Velocity and acceleration vector of a charged particle moving in a magnetic field at some instant are and . Select the correct options.

This question has multiple correct options
A

B

C

Magnetic field has a component along the z-direction

D

Kinetic energy of the particle is constant

Hard
Solution
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Correct options are A) , C) and D)

Under the influence of magnetic field only, speed and hence, kinetic energy remains constant.

As  

So



Let the magnetic field is , then from




Hence, magnetic field has a component along z-direction.

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