A square coil of side having 1000 turns is rotated with a uniform speed in a magnetic field about an axis perpendicular to the direction of the field. At an instant , the emf induced in the coil is . The magnetic induction is

A coil of circular cross-section having 1000 turns and  face area is placed with its axis parallel to a magnetic field which decreases by  in . The e.m.f. induced in the coil is:        

An equilateral triangular loop  made of uniform thin wires is being pulled out of a region with a uniform speed , where a uniform magnetic field  perpendicular to the plane of the loop exists. At time , the point  is at the edge of the magnetic field. The induced current (I) vs time  graph will be as     

Consider the situation shown. The wire is sliding on fixed rails with a constant velocity. If the wire  is replaced by semi-circular wire, the magnitude of induced e.m.f. will             

A circular wire of radius  rotates about its own axis with angular speed  in a magnetic field  perpendicular to its plane, then the induced e.m.f. is                

A copper disc of radius  rotated about its centre with 10 revolutions per second in a uniform magnetic field of 0.1 tesla with its plane perpendicular to the field: The e.m.f. induced across the radius of disc is

A conducting ring of radius  kept in a uniform magnetic field  of , rotates uniformly with an angular velocity  with its axis of rotation perpendicular to . The maximum induced emf in it is