A) \[F\ne 0,\,\,\,\tau \ne 0\]
B) \[F\ne 0,\,\,\,\tau =0\]
C) \[F=0,\,\,\,\tau \ne 0\]
D) \[F=0,\,\,\,\tau =0\]
Correct Answer: C
Solution :
In a uniform magnetic field, the torque acts on a magnetic needle but force does not. Therefore, \[\tau \ne 0,F=0\]
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