A conducting solid sphere having uniform charge Q on it has radius R. It is rotating with anangular velocity ω. If a uniform magnetic field B is present perpendicular to axis of rotation then the torque on sphere will be

A conducting rod AB of length l is rotated about point O with an angular velocity velocity omega in a uniform magnetic field (B_0) directed perpendicular into the plane of rotation as shown in the figure. The value of V_B - V_A is

A non-conducting disc having unifrom positive charge Q , is rotating about its axis with unifrom angular velocity omega .The magnetic field at the centre of the disc is.

A non-conducting disc having unifrom positive charge Q , is rotating about its axis with unifrom angular velocity omega .The magnetic field at the centre of the disc is.

A conducting ring of radius r having charge q is rotating with angular velocity omega about its axes. Find the magnetic field at the centre of the ring.

A conducting ring of radius r having charge q is rotating with angular velocity omega about its axes. Find the magnetic field at the centre of the ring.

A conducting ring of radius r having charge q is rotating with angular velocity omega about its axes. Find the magnetic field at the centre of the ring.

A conducting disc of radius r rotaes with a small but constant angular velocity omega about its axis. A uniform magnetic field B exists parallel to the axis of rotation. Find the motional emf between the centre and the periphery of the disc.

A conducting disc of radius r rotaes with a small but constant angular velocity omega about its axis. A uniform magnetic field B exists parallel to the axis of rotation. Find the motional emf between the centre and the periphery of the disc.

A conducting disc of radius r rotaes with a small but constant angular velocity omega about its axis. A uniform magnetic field B exists parallel to the axis of rotation. Find the motional emf between the centre and the periphery of the disc.

A conducting circular loop of radius r is rotated about its diameter at a constant angular velocity omega in a magnetic field B perpendicular to the axis of rotation. In what position of the loop is the induced emf zero?