A certain elastic conducting material is stretched into a circular loop of 12.0 cm radius. It is placed with its plane perpendicular to a uniform 0.800 T magnetic field. When released, the radius of the loop starts to shrink at an instantaneous rate of 75.0 cm/s . What emf is induced in the loop at that instant

The induced emf in the loop is 0.452 volts.

Explanation:

Given that,

Radius of the circular loop, r = 12 cm = 0.012 m

Magnetic  field, B = 0.8 T    

When released, the radius of the loop starts to shrink at an instantaneous rate of,

The induced emf in the loop is equal to the rate of change of magnetic flux. It is given by :

So, the induced emf in the loop is 0.452 volts.

the maxium height is 34m/s