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The charge flowing through a resistance ...

The charge flowing through a resistance R varies with time t as `Q=at-bt^(2)`, where a and b are positive constants The total heat produced in R is -

(A) `(a^3R)/(3b)`
(B) `(a^3R)/(2b)`
(C) `(a^3R)/(b)`
(D) `(a^3R)/(6b)`

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