Moving Charges and Magnetism

Question: A proton (or charged particle) moving with velocity v is acted upon by electric field E and magnetic field B. The proton will move undeflected if

1) E is perpendicular to B

2) E is parallel to v and perpendicular to B

3) E, B and v are mutually perpendicular and $v = \frac{E}{B}$

4) E and B both are parallel to v

Solution:

Explanation: No Explanation

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