filter
  • Subject:

    ...

  • Topic:

    ...

The resistivity of iron is 1 × 10–7 ohm m. The resistance of a iron wire of particular length and thickness is 1 ohm. If the length and the diameter of wire both are doubled, then the resistivity in ohm m will be 

(1) 1 × 10–7

(2) 2 × 10–7

(3) 4 × 10–7

(4) 8 × 10–7

PMT