NDA 2019 Physics question
Two metallic wires A and B are made using copper. The radius of wire A is while its length is . A dc voltage is applied across the wire A, causing power dissipation, . The radius of wire B is and its length is and the same dc voltage is applied across it causing power dissipation . Which one of the following is the correct relationship between and ?
Answer: (B)
Solution
and . At the
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