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PhysicsNEET 2023Ohm's law, resistivity, temperature dependence

Current Electricity

The resistance of a platinum wire at 0∘0^\circC is 2Ω2 \Omega and 6.8Ω6.8 \Omega at 80∘80^\circC. The temperature coefficient of resistance of the wire is:

  1. A.3×10−4 ∘C−13 \times 10^{-4}\ ^\circ\mathrm{C}^{-1}
  2. B.3×10−3 ∘C−13 \times 10^{-3}\ ^\circ\mathrm{C}^{-1}
  3. C.3×10−2 ∘C−13 \times 10^{-2}\ ^\circ\mathrm{C}^{-1}✓
  4. D.3×10−1 ∘C−13 \times 10^{-1}\ ^\circ\mathrm{C}^{-1}

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