A physicist works in a laboratory where the magnetic field is 2 T. She – McqOptions

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1.	A physicist works in a laboratory where the magnetic field is 2 T. She wears a necklace enclosing area 0.01 m2 in such a way that the plane of the necklace is normal to the field and is having a resistance R = 0.01 W. Because of power failure, the field decays to 1 T in time 10?3 seconds. Then what is the total heat produced in her necklace ? (T = Tesla) [Orissa JEE 2002]
A.	10 J
B.	20 J
C.	30 J
D.	40 J
Answer» B. 20 J

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