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An alternating voltage V=140 sin 50 t is...

An alternating voltage V=140 sin 50 t is applied to a resistor of resistance 10 `Omega`. This voltage produces `triangleH` heat in the resistor in time `trianglet`. To produce the same heat in the same time, rquired DC current is

A

14 A

B

about 20 A

C

about 10 A

D

None of these

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