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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 & B both parallel

D

E & B inclined at `45^(@)` angle

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The correct Answer is:
A
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