1.

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    [Roorkee 1999]

A.            \[{{v}_{\text{P}}}={{v}_{\text{Q}}}\]                            
B.            \[{{v}_{\text{P}}}={{v}_{\text{Q}}}\]
C.            \[{{v}_{\text{P}}}=\frac{1}{4}{{v}_{\text{Q}}}\]
D.            \[{{v}_{\text{P}}}=\text{ 2}{{v}_{\text{Q}}}\]
Answer» D.            \[{{v}_{\text{P}}}=\text{ 2}{{v}_{\text{Q}}}\]


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