Consider the situation shown in the figure. The wire AB is slid on the fixed rails with a constant velocity. If the wire AB is replaced by a semicircular wire, the magnitude of the induced current will
Draw the equivalent circuit
The formula used: The emf induced across A and B is
Where v is the speed
B is the magnetic field
l is the length
The induced emf will serve as a voltage source. The direction of the current is anticlockwise, according to Lenz’s law.
According to Lenz's law, the direction of the induced current is such that it opposes the magnetic field that has induced it.
Putting the value in the above equation, we get
The induced emf depends on the length of the wire but not on the shape of the wire.
If the wire is replaced by a semicircular wire, the induced emf will be same.