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A charged paricle goes undeflected in a ...

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

A

`vecE||vecB,vecv||vecE`

B

`vecE` is not parallel to `vecB`

C

`vecv||vecB but vecE` is not parallel to `vecB`

D

`vecE||vecB but vecv` is not parallel to `vecE`

Text Solution

Verified by Experts

The correct Answer is:
(a,b)
If electric field is parallel to magnetic field,the charged particle
moving parallel to `vecE` experiences a forces in the direction of `vecE`.
due to `vecB` 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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