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MHT CET Physics question

PhysicsAlternating CurrentMHT CET

What is the r.m.s. value of an alternating current which when passed through a resistor produces heat which is thrice of that produced by a direct current of 2 ampere in the same resistor?

Answer: (C)

Solution

Heat is proportional to the square of the current, so and $ =

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Question ID VK-082003