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Question

A circular conductor is made of a uniform wire of resistance 2 x 103 ohm/metre and the diameter of this circular conductor is 2 metres. Then the resistance measured between the ends of the diameter is (in ohms)
  1. π×103
  2. 2π×103
  3. 4π×103
  4. 4×103

A
π×103
B
4×103
C
4π×103
D
2π×103
Solution
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The resistance per unit length is given to be R=2×103
The length can be calculated as L=π×D, where D is given diameter of 2 m.
Hence L=2π

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