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PhysicsNEET 2022Ohm's law, resistivity, temperature dependence

Current Electricity

A copper wire of length 10 m and radius (10−2π)\left(\dfrac{10^{-2}}{\sqrt{\pi}}\right) m has electrical resistance of 10Ω10 \Omega. The current density in the wire for an electric field strength of 10 V/m is:

  1. A.105 A/m210^{5}\ \mathrm{A/m^2}✓
  2. B.104 A/m210^{4}\ \mathrm{A/m^2}
  3. C.106 A/m210^{6}\ \mathrm{A/m^2}
  4. D.10−5 A/m210^{-5}\ \mathrm{A/m^2}

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