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  4. Rate of dissipation of Joule’s heat in resistance per unit volume is :- (symbols have usual meaning)

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Q. Rate of dissipation of Joule’s heat in resistance per unit volume is :- (symbols have usual meaning)

NTA AbhyasNTA Abhyas 2020

Solution:

$\frac{d H}{d t}\times \frac{1}{ V}=\frac{i^{2} R}{A \ell }=\frac{i}{A}\frac{i R}{\ell }=J\frac{V}{\ell }$
$=\frac{J E \ell }{\ell }=JE$