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Byju's Answer

Standard XII

Physics

The Circular Motion

A charged par...

Question

A charged particle goes undeflected in a region containing electric and magnetic field. It is possible that

\to E | | \to B, \to v | | \to E

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\to E

is not parallel to

\to B

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\to v | | \to B

but

\to E

is not parallel to

\to B

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\to E | | \to B

but

\to v

is not parallel to

\to E

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Solution

The correct options are
A $\to E | | \to B, \to v | | \to E$
B $\to E$ is not parallel to $\to B$
If electric field is parallel to magnetic field, the charged particle moving parallel to $\to E$ experiences a force in the direction of $\to E$ ; due to $\to B$ there will not be any force.
hence no deflection
The particle may go undeflected in the case when forces due to electric field and magnetic field balance each other.

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