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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`

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The correct Answer is:
A, B, D
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