JEE Advanced 2020 Full Test 2 Paper 2

Two long straight wires of telephone circuit inside a house are coplanar with and run parallel to a third long straight conductor that carries a current i=i0‌sin‌ω‌t. The wires are at a distance of d1 and d2 from the conductor. The conductor induced a noise in the telephone circuit. The rms voltage per unit length of this induced emf is x×5, find x ?
Express your answer in µ∨. Take d2=2d1,i0=‌

2√2

ln‌2

Aω=50rad∕s