A uniform but time varying magnetic field `B(t)` exist in a circular region of radius `a` and is directed into the plane of the paper as shown. The magnitude of the induced electric field at point `P` at a distance `r` form the centre of the circular region.

A uniform but time-varying magnetic field B (t) exists in a circular region of radius a and is directed into the plane of the paper as shown . The magnitude of the induced electric field at point P at a distance r from the centre of the circular region is

A uniform but time-varying magnetic field B(t) exists in a circular region of radius a and is directed into the plane of the paper, as shown. The magnitude of the induced electric field at point P at a distance r from the centre of the circular region

A uniform but time-varying magnetic field B(t) exists in a circular region of radius a and is directed into the plane of the paper, as shown. The magnitude of the induced electric field at point P at a distance r from the centre of the circular region

A uniform but time-varying magnetic field B(t) exists with in a circular region of radius a and is directed in to the plane of the paper as shown in the figure. The magnitude of the induced electric field at the point P at a distance r from the centre of the circular region

A uniform but time varying magnetic field is present in a circular region of radius R. The magnetic field is perpendicular and into the plane of the loop and the magnitude of field is increasing at a constant rate alpha . There is a straight conducting rod of length 2R placed as shown in figure. The magnitude of induced emf across the rod is