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Q.

Rate of dissipation of joule heat in resistance per unit volume is (E is electric field, $ρ$ resistivity):-

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a

$\frac{E}{ρ}$

b

$\frac{E^{2}}{ρ^{2}}$

c

$E^{2} σ^{2}$

d

$\frac{E^{2}}{ρ}$

answer is B.

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Detailed Solution

$\frac{i^{2} R}{A l} = \frac{i^{2} ρ l}{A l . A} = {(\frac{i}{A})}^{2} ρ \frac{i^{2} R}{A l} = \frac{i^{2} ρ l}{A l . A} = {(\frac{i}{A})}^{2} ρ$

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