A non conducting ring of radius R is charged as shown in figure : Figure

The figure shows a non conducting ring of radius R carrying a charge q . In a circular region of Radius r , a uniform magnetic field B perpendicular to the plane of the ring varies at a constant rate (dB)/(dt)=beta . The torque on the ring is

The figure shows a non conducting ring of radius R carrying a charge q . In a circular region of Radius r , a uniform magnetic field B perpendicular to the plane of the ring varies at a constant rate (dB)/(dt)=beta . The torque on the ring is

Inside a charged thin conducting shell of radius R, a point charge +Q is placed as shown in figure potential of shell may be

Inside a charged thin conducting shell of radius R, a point charge +Q is placed as shown in figure potential of shell may be

A point charge q is placed at some distance d away from the centre of a grounded conducting sphere of radius r, as shown in the figure. The charge that flows the earth to the sphere is

A point charge q is placed at some distance d away from the centre of a grounded conducting sphere of radius r, as shown in the figure. The charge that flows the earth to the sphere is

A non - conducting disc of radius R is uniformly charged with surface charge density sigma . A disc of radius (R )/(2) is cut from the disc, as shown in the figure. The electric potential at centre C of large disc will be

A non-conducting ring of radius R has charge Q distributed unevenly over it. If it rotates with an angular velocity omega the equivalent current will be: