A non-conducting ring of radius r has charge per unit length `lambda`. A magnetic field perpendicular to plane of the ring changes at rate Db/dt. Torque experienced by the ring is

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

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

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

The figure shows a conducting ring of radius R . A uniform steady magnetic field B lies perpendicular to the plane of the ring a circular region r (lt R) . If the resistance per unit length of the ring is lamda , then the current induced in the ring when its radius gets doubled is

The figure shows a conducting ring of radius R . A uniform steady magnetic field B lies perpendicular to the plane of the ring a circular region r (lt R) . If the resistance per unit length of the ring is lamda , then the current induced in the ring when its radius gets doubled is