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The Circular Motion

Question

An electron enters a region where magnetic field (B) and electric field (E) are mutually perpendicular, then
it will always move in the direction of B
it will always move in the direction of E
it always possesses circular motion
it can go undeflected also

A

it always possesses circular motion

B

it will always move in the direction of E

C

it will always move in the direction of B

D

it can go undeflected also

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Solution

Verified by Toppr

If the magnetic force balances the electric force then electron can go undeflected.
$q \to E = q (\to v \times \to B)$
However it can never always move in direction of B since magnetic force acts perpendicular to the motion.
Since there is magnetic field also present therefore, it will not only move in the direction of E.
Due to presence of E circular motion cannot occur.

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