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A magnetic flux through a stationary loo...

A magnetic flux through a stationary loop with a resistance `R` varies during the time interval `tau` as `phi=at(tau-t)`. Find the amount of heat the generated in the loop during that time

A

`(a^(2)tau^(3))/(4R)`

B

`(a^(2)tau^(3))/(3R)`

C

`(a^(2)tau^(3))/(6R)`

D

`(a^(2)tau^(3))/(2R)`

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