Two copper wires P and Q of equal length have cross-sectional areas in the ratio

PHYSICS · Single correct · CBSE · Physics · Current Electricity · Current Electricity

Problem

Two copper wires P and Q of equal length have cross-sectional areas in the ratio 1:21:2. They are connected in series to the same battery so that the same current flows through both. Which relation correctly compares the heat produced in the wires in the same time interval? (a) HP=HQH_{\text P}=H_{\text Q} (b) HP=12HQH_{\text P}=\dfrac{1}{2}H_{\text Q} (c) HP=2HQH_{\text P}=2H_{\text Q} (d) HP=4HQH_{\text P}=4H_{\text Q}

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