Current Electricity · JEE Main previous year questions

2015 4 questions

1. Q452015 · 4 Apr 2015 · Shift 1

   When $5\mathrm{V}$ potential difference is applied across a wire of length $0.1\mathrm{m}$, the drift speed of electrons is $2.5\times 10^{-4}\mathrm{m}{\mathrm{s}}^{-1}$. If the electron density in the wire is $8\times 10^{28}{\mathrm{m}}^{-3}$, the resistivity of the material is close to :

   1. A.$1.6\times 10^{-6}\Omega \mathrm{m}$
   2. B.$1.6\times 10^{-5}\Omega \mathrm{m}$
   3. C.$1.6\times 10^{-8}\Omega \mathrm{m}$
   4. D.$1.6\times 10^{-7}\Omega \mathrm{m}$
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   Answer: B

2. Q462015 · 4 Apr 2015 · Shift 1
   
   1. A.$0.13\mathrm{A}$, from $Q$ to $P$
   2. B.$0.13\mathrm{A}$, from $P$ to $Q$
   3. C.$1.3\mathrm{A}$ from $P$ to $Q$
   4. D.$0\mathrm{A}$
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   Answer: A

3. Q522015 · 4 Apr 2015 · Shift 1
   
   1. A.$6.7\mathrm{mA}$
   2. B.$0.67\mathrm{mA}$
   3. C.$100\mathrm{mA}$
   4. D.$67\mathrm{mA}$
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   Answer: B

4. Q572015 · 4 Apr 2015 · Shift 1
   
   1. A.
   2. B.
   3. C.
   4. D.
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   Answer: A