A material … has twice the specific resistance of … A circular wire made of … has twice the diameter of a wire made of …. Then for the two wires to have the same resistance, the ratio … of their respective lengths must be

Current Electricity

JEE Main 2004 · Annual, Paper 1 · Q6508

PhysicsMedium226×since 2002Q6508

A material

'B'

has twice the specific resistance of

'A'.

A circular wire made of

'B'

has twice the diameter of a wire made of

'A'

. Then for the two wires to have the same resistance, the ratio

{l \over B}/{l \over A}

of their respective lengths must be