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Q.

 A charged particle is rotating in a circle. Then, magnetic field (B) at centre of circle and magnetic moment(M) produced by motion of changed particle 

 

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a

 are parallel.

b

are not parallel.

c

Can't say.

d

 may be parallel.

answer is C.

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Detailed Solution

If the positive charged particle is rotating in a circle in clockwise direction, then equivalent current is in clockwise. Therefore, at centre B and M are both inwards. Hence, they are parallel. But at some other point they may not be parallel. 

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 A charged particle is rotating in a circle. Then, magnetic field (B→) at centre of circle and magnetic moment(M→) produced by motion of changed particle