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Two metallic wires A and B are made using copper. The radius of wire A is r while its length is l. A dc voltage V is applied across the wire A, causing power dissipation, P. The radius of wire B is 2r, and its length is 2l and the same dc voltage V is applied across it causing power dissipation P1. Which one of the following is the correct relationship between P and P1 ?

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Two metallic wires A and B are made using copper. The radius of wire A is r while its length is l. A dc voltage V is applied across the wire A, causing power dissipation, P. The radius of wire B is 2r, and its length is 2l and the same dc voltage V is applied across it causing power dissipation P<sub>1</sub>. Which one of the following is the correct relationship between P and P<sub>1</sub> ?






 
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