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NDA General Science Physics Questions Part 3

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Question : 34

Total: 91

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 ?

P=2P‌1
P= P‌1/2
P=4P‌1
P= P‌1

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