A conducting metal circular-wire-loop of radius r is placed perpendicular to a magnetic field which varies with time as `B = B_0e^(-t//tau)`, where `B_0 and tau` are constants, at time = 0. If the resistance of the loop is R then the heat generated in the loop after a long time `(t to oo)` is :
A
`(pi^2r^4B_0^2R)/(tau)`
B
`(pi^2r^4B_0^4)/(2tauR)`
C
`(pi^2r^4B_0^4)/(2tauR)`
D
`(pi^2r^4B^2)/(tauR)`
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