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Q.

According to Joule's law, if the potential difference across a conductor having a material of specific resistance remains constant,then the heat produced in the conductor is directly proportional to

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a

ρ

b

ρ2

c

d

answer is D.

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Detailed Solution

P=V2R  but  R=ρlA ⇒ P=V2ρl/A = AV2ρl.  Since  AV2lis constant as per given conditions so P ∝1ρ.
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According to Joule's law, if the potential difference across a conductor having a material of specific resistance remains constant,then the heat produced in the conductor is directly proportional to