Question

If the resistivity of the conductor is doubled, then it's resistance becomes the original value.

• A. half
• B. twice
• C. three -fourth
• D. one - fourth

Answer 1

The correct option is B twice

Resistance of a material is given by,

$R=\rho \frac{l}{A}$
Resistance depends directly upon the the resistivity ($\rho$) and the length (l) but is inversely proportional to the area of cross section of the conductor. Thus, doubling the resistivity doubles the resistance of the conductor.