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A proton moving with a constant velocity...

A proton moving with a constant velocity passes through a region of space without any changing its velocity. If `E` and `B` represent the electric and magnetic fields, respectively. Then, this region of space may have

A

`E=0, B=0`

B

`E=0, B!=0`

C

`E!=0, B=0`

D

`E!=0, B!=0`

Text Solution

Verified by Experts

The correct Answer is:
(a,b,d)
There is no change in velocity. It can be possible when electric and magnetic field are absent, i.e., `E=0, B=0`.
Or when electric and magnetic fields are present but force due to electric field is equal and opposite to the due to magnetic
field, (i.e.,`E!=0 B!=0`).
Or when `E=0` but `B!=0`.
`F=q upsilonB sin theta` i.e.,
`sin theta=0`, i.e., `theta=0 implies upsilon` and B are in the same direction.
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