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A d.c. voltage with ripple V = V1 + V2 c...

A d.c. voltage with ripple `V = V_1 + V_2 cos omegat` is applied to a resistor R. The heat produced is

A

`(V_1^2+V_2^2)//2R`

B

`(2V_1^2+V_2^2)//2R`

C

`(V_1^2+2V_2^2)//2R`

D

none of these.

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