The magnetic field at a distance of 2 cm from a current carrying wire is 4 μT. What is the magnetic field at a distance of 1 cm from the wire?
A) 2 μT
B) 4 μT
C) 6 μT
D) 8 μT
E) 10 μT

Question

Quizplus · Accepted Answer

The magnetic field around a long straight current-carrying wire is inversely proportional to the distance from the wire. If the distance is halved, the magnetic field doubles. Therefore, at 1 cm, the magnetic field is 8 μT.

The Magnetic Field at a Distance of 2 Cm from a Current