1.

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 [MP PMT 1995, 2003; UPSEAT 2002; DPMT 2003]

A.            E is perpendicular to B
B.            E is parallel to v and perpendicular to B
C.            E, B and v are mutually perpendicular and \[v=\frac{E}{B}\]
D.            E and B both are parallel to v
Answer» D.            E and B both are parallel to v


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