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PhysicsNEET 2025Ohm's law, resistivity, temperature dependence

Current Electricity

A wire of resistance RR is cut into 8 equal pieces. From these pieces two equivalent resistances are made by adding four of them together in parallel. Then these two sets are added in series. The net effective resistance of the combination is:

  1. A.R64\dfrac{R}{64}
  2. B.R32\dfrac{R}{32}
  3. C.R16\dfrac{R}{16}✓
  4. D.R8\dfrac{R}{8}

Solution

Each piece is R8\frac{R}{8}. Four in parallel give R32\frac{R}{32}; two such sets in series give R16\frac{R}{16}.

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