A uniform field `B` increasing with time exists in a cylindrical region of centre `O` and radius `R`. The direction of magnetic field is inwards the paper as shown. The work done by external agent in taking a unit positive charge slowly from `A` to `C` via paths `APC, AOC` and `AQC` be `W_(APC), Q_(AOC)` and `W_(AQC)` respectively. Then-

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 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) 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) 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 exists in a cylindrical region as shown in the figure. The direction of magnetic field is into the plane of the paper and its magnitude is decreasing at a constant rate of 2xx10^-3T//s . A particle of charge 1muC is moved slowly along circle of radius 1m by an external force as shown in figure. The plane of the circle of radius 1m by an external force as shown in figure. The plane of he circle lies in the plane of the paper and it is concentric with the cylindrical region. The work done by the external force in moving this charge along the circle will be

A uniform but time varying magnetic field exists in a cylindrical region as shown in the figure. The direction of magnetic field is into the plane of the paper and its magnitude is decreasing at a constant rate of 2xx10^-3T//s . A particle of charge 1muC is moved slowly along circle of radius 1m by an external force as shown in figure. The plane of the circle of radius 1m by an external force as shown in figure. The plane of he circle lies in the plane of the paper and it is concentric with the cylindrical region. The work done by the external force in moving this charge along the circle will be