A uniform magnetic field is perpendicular to the plane of a circular loop of diameter 13 cm formed from wire of diameter 2.6 mm and resistivity of 2.18 × 10-8Ω·m. At what rate must the magnitude of the magnetic field change to induce a 11 A current in the loop?

Rate of change of magnetic field is        

Explanation:

We have given diameter of the circular loop is 13 cm = 0.13 m

So radius of the circular loop

Length of the circular loop

Wire is made up of diameter of 2.6 mm

So radius

Cross sectional area of wire

Resistivity of wire

Resistance of wire

Current is given i = 11 A

So emf  

Emf induced in the coil is