When a charged particle moving with velocity V is subjected to a magnetic field of induction B , the force on it is non-zero. This implies the:-

NEET 2006 Physics question

When a charged particle moving with velocity is subjected to a magnetic field of induction , the force on it is non-zero. This implies the:-

(1)Angle between and is necessary
(2)Angle between and can have at value other than
(3)Angle between and can have at value other than zero and Correct
(4)Angle between and is either zero or

Answer: (3)

Solution

The magnetic force is , of magnitude . requires , i.e. and ; any other angle (not only ) gives a non-zero force. This is exactly option (3). Option (1) is wrong because

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Question ID VK-089539