Question

In an overhead straight wire, the current is north. The magnetic field due to this current, at our point of observation, is:

a.east
b.up
c.north
d.down
e.west

Answer 1

Using the right-hand rule, the magnetic field at a point to the east of a northward-flowing current is directed downwards.

Step-by-step explanation:

The direction of the magnetic field around a straight wire carrying an electric current can be determined using the right-hand rule. For a current flowing northwards, you would point your right thumb up (north) and then your fingers would curl around the wire in the direction of the magnetic field. Accordingly, at the point of observation to the east of the wire, your fingers would be pointing towards the ground, indicating that the magnetic field at that point is directed downwards.