First slide

Force on a charged particle moving in a magnetic field

Question

In a gravity free space a charged particle is projected. If the kinetic energy of the particle changes and it also suffers deviation, then in that region of space

Moderate

A

B = 0 and E = 0
B

‘B’ may not be zero and ‘E’ must not be zero
C

‘B’ must be zero and ‘E’ may be zero
D

E = 0 and B $\neq$ 0

Solution

If B $\neq$ 0 and E $\neq$ 0and the particle is projected making some angle with $\vec{B}$ or $\vec{E}$ or both $\vec{E}$ and $\vec{B}$ , then due to the action of magnetic force speed of the particle does not change but due to the action of electric force speed i.e. kinetic energy of the particle changes and it suffers deviation also.
But if E = 0 and the particle is projected making an angle with $\vec{B}$ , then it suffers deviation but its kinetic energy remains unchanged.
Hence option (2) is correct.

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