Question

A wire is turned into circles with 100 turn of radius 35 cm what current should be passed through it to produce a magnetic field of 1t at its centre

Answer 1

Here r is the radius of coil and I is the current passing through coil.

now,I = 0.4A , r = 8cm = 0.08 m and

so, B = (4π × 10^-7 × 0.4)/(2 × 0.08) × 100

= 3.14 × 10^-4 T

hence , magnetic field , B = 3.14 × 10^-4 T