Question

A long straight wire carries a current of 35 A. What is the magnitude of the field

B

→

at a point 20 cm from the wire ?​

Answer 1

Answer:

Current in the wire, I = 35 A

Distance of a point from the wire, r = 20 cm = 0.2 m

Magnitude of the magnetic field at this point is given as:

B

Where,

μ0= Permeability of free space = 4π × 10–7 T m A–1

Hence, the magnitude of the magnetic field at a point 20 cm from the wire is 3.5 × 10–5 T.

Answer 2

What is the magnitude of the field B at a point 20 cm from the wire? Hence, the magnitude of the magnetic field at a point 20 cm from the wire is 3.5 × 10–5 T.