# A wire has a resistance R If its length is doubled and radius is reduced to half then its resistance will become? (A) 2R (B) 4R(Cy8R D) 16R

##### 1 Answer

Jun 13, 2018

#### Explanation:

Resistance of wire of circular cross section is given by

#"R" = "ρL"/"πr"^2#

For the same type of wire

#"R" ∝ "L"/"r"^2#

From above