Question

A current carrying loop is placed near a long straight wire which also conducts a current. The direction of currents are shown in the figure, then which of the following options are correct?

• A. The wire is attracted towards the loop
• B. The wire is repelled from the loop
• C. The wire does not experience any force
• D. The wire will have attraction or repulsion depending on the magnitudes of the currents

Answer 1

The correct option is B The wire is repelled from the loop

If we use fleming’s left hand rule to determine the direction of the magnetic field from the side of the rectangle which is nearer to the wire, we can see that the magnetic field will repel the wire. Since this force is greater than the force applied by the farther side of the loop on the wire, the net effect is that the loop repels the wire.