A) if both electric and magnetic fields are normal to v
B) if the magnetic field alone in normal to v
C) if both electric and magnetic fields are parallel to v
D) if the electric field alone is normal to v
Correct Answer: A
Solution :
When \[E\ne 0\] and \[B\ne 0\] and E, B and motion of proton (v) are mutually perpendicular, there may be no net force. Force due to E and B cancel each other.
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