Question

if the length of the wire having resistance 2 ohm , gets thrice and area gets half then find out its new resistance

Answer 1

R = ρ L / A where R is resistance of wire

R2 / R1 = L2 A1 / (L1 * A2)

R2 / R1 = (L2 / L1) * (A1 / A2) = 3 * 2 = 6

R2 = 6 * 2 = 12 Ω