There is a uniform magnetic field `B` in a circular region of radius `R` as shown in Fig. 3.149 whose magnitude changes at the rate of `dB//dt`. The emf circular concentric conducting arc of radius `R_(1)` having an angle `theta` as shown `(-OAO' = theta)` is

The flux of electric field through the circular region of radius r as shown in the figure is

Magnetic field in cylindrical region of radius R in inward direction is as shown in figure.

Magnetic field in cylindrical region of radius R in inward direction is as shown in figure.

The magnetic field perpendicular to the plane of a conducting ring of radius r changes at the rate. (dB)/(dt) . Then

There is a uniform magnetic field (B) perpendicular to the plane of the figure in a circular region of radius a centred at O. ABCD is a conducing loop in the plane of the figure with its arms BC and DA along two radial lines from O having an angle theta between them. AB is circular arc of radius OB = d centred at O. CD is also a circular arc of radius OC = b centred at O. The magnetic field is changed at a rate (dB)/(dt) . (a) The emf induced in the loop ABCD. (b) Find emf induced in arc AB.

In a very long solenoid of radius R , if the magnetic field chabges at the rate of dB//dt.AB = BC The induced emf for the trianglar circuit ABC shown in Fig. 3.196 is

In a very long solenoid of radius R , if the magnetic field chabges at the rate of dB//dt.AB = BC The induced emf for the trianglar circuit ABC shown in Fig. 3.196 is