First slide

Force on a current carrying wire placed in a magnetic field

Question

A rectangular loop carrying a current ‘i’ is situated near a long straight wire such that the wire is parallel to one of the sides of the loop and is in the plane of the loop. If steady current I is established in the wire as shown in figure, the loop will

Moderate

A

Rotate about an axis parallel to the wire
B

Move away from the wire
C

Move toward the wire
D

Remain stationary

Solution

Attractive force with wire (1) is $F_{1}$ . And the repulsive force with wire (2) is $F_{2}$
$N o w, |\vec{F_{1}}| > |\vec{F_{2}}|$
So, on a net the loop will feel net attractive force, Hence it will move towards the wire.

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