If a magnet of length 10 cm and pole strength 40 A-m is placed at an a – McqOptions

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1.	If a magnet of length 10 cm and pole strength 40 A-m is placed at an angle of 45o in an uniform induction field of intensity 2 ´ 10?4 T, the couple acting on it is [Pb. PMT 1999; MH CET (Med.) 1999]
A.	0.5656 ´ 10?4 N-m
B.	0.5656 ´ 10?3 N-m
C.	0.656 ´ 10?4 N-m
D.	0.656 ´ 10?5 N-m
Answer» C. 0.656 ´ 10?4 N-m

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