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Home  >>  JEEMAIN and AIPMT  >>  Physics  >>  Class12  >>  Current Electricity
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Which of these is correct for each pair of statements? \[\] Statement 1: When an electric current at the junction of two wires of the same material is directed from the thick wire to the thin wire, the drift speed of the electrons increase as they pass through the cross-section \[\] Statement 2: The drift speed of electrons is directly proportional to the electric field in the wire.

$\begin {array} {1 1} (A)\;Both \: statements\: are\: true.\: Statements\: 2\: is\: a\: correct \: explanation \: for \: statement\: 1 \\ (B)\; Both \: statements\: are\: true.\: Statements\: 2 \: is \: not\: a \: correct\: explanation\: for\: statement\: 1 \\ (C)\; Statement\: 1\: is\: true,\: statement\: 2 \: is \: false \\ (D)\;Statement \: 1\: is\: false, \: statements \: 2\: is \: false \end {array}$


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Since the current density in the thick wire is less, the electric field is less
and hence drift velocity is less
Ans : (A)
answered Feb 10, 2014 by thanvigandhi_1
edited Mar 14, 2014 by thanvigandhi_1

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