Question

Find the height of an infinitely long conductor from point P which is carrying current of 6.28A and field intensity is 0.5 units.

(a) 0.5

(b) 2

(c) 6.28

(d) 1

The question was asked in examination.

Origin of the question is Magnetic Field Intensity in division Magnetostics of Electromagnetic Theory

Answer 1

Right choice is (b) 2

The explanation: The magnetic field intensity of an infinitely long conductor is given by H = I/2πh. Put I = 6.28 and H = 0.5, we get h = 1/0.5 = 2 units.