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A : The drift velocity of electrons in a metallic wire will decrease, if the temperature of the wire is increased. R: On increasing temperature, conductivity of metallic wire decreases. |
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Answer» Both Assertion and REASON are true and the Reason is correct explanation of the Assertion. In `v_(d) = a tau, tau ` is the relaxation TIME and a is acceleration. As TEMPERATURE INCREASE `tau` decreases, so `v_(d)` also decreases. Conductance of metal is `sigma = (l)/(RA)` As temperature increases R increases and `sigma` decreases . So Reason is also correct but it is not the correct explanation of Assertion. |
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