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Q.

A constant voltage is applied between the two ends of a uniform metallic wire. Some heat is developed in it. The heat developed is doubled if

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a

both the length and the radius of the wire are halved

b

both the length and the radius of the wire are doubled

c

the radius of the wire is doubled

d

the length of the wire is doubled

answer is B.

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Detailed Solution

P=V2R=  V2Aρl  ∝  r2l   V  →  same
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A constant voltage is applied between the two ends of a uniform metallic wire. Some heat is developed in it. The heat developed is doubled if