A current I is passing through a wire having two sections P and Q of uniform diameters d and d/2 respectively. If the mean drift velocity of electrons in sections P and Q is denoted by vPand vQ respectively, then

Question:

A current I is passing through a wire having two sections P and Q of uniform diameters d and d/2 respectively. If the mean drift velocity of electrons in sections P and Q is denoted by vP and vQ respectively, then

Options :

a)vP=vQ
b)vP=1/2vQ
c)vP=1/4vQ
d)vP=2vQ

Answer :

c)vP=1/4vQ

Answer Steps :

Step:-1

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