A metal rod `1/ sqrt(pi)` meter long rotates about one of its ends in a plane perpendicular to a uniform magnetic induction `5 xx 10^-3 (Wb)/m^2`. Calculate the number of revolutions the rod makes per minute if the induced e.m.f. across it is 15 millivolt.

A metal rod 1/ (sqrt(pi)) meter long rotates about one of its ends perpendicular to a plane whose magnetic induction is 4xx10^-3T . Calculate the number of revolutions made by the rod per second if the e.m.f. induced between the ends of the rod is 16mV.

A metal rod of length 1 m is rotated about one of its endsin a plane at right anglesto a uniform magnetic field of induction 2.5 xx 10^-3Wb//m^2 . If it makes 1800 r.p.m. calculate the induced emf between it.

A coil having 50 turns and an area of 800cm^2 is held with its plane perpendicular to uniform magnetic field of induction 5 xx 10^-5 Wb/m^2 .If it is pulled out of the field in 2 second ,then the e.m.f.induced in the coil will be

A metal rod of length lm, rotates about its one end in a plane at right angles to a horizontal magnetic field of induction 7/22xx10^-4T If the frequency of rotation is 10Hz, then the magnitude of induced emf is

A rod of length l is rotated about its one end, perpendicular to a magnetic field of induction B What is the e.m.f induced in the rod

A coil of 10^3 turns each of area 100 cm^2 rotateswith speed of 100 r.p.m. about an axis in its plane and perpendicular to uniform field of induction 36 xx 10^-2 Wb//m^2 . Find the peak and e.m.f. value of the induced e.m.f. in the coil.

The torque acting on a magnetie dipole of moment 5 A m^(2) when placed in an external uniform magnetic induction 1.5 xx 10^(-4)" Wb/m"^(2) at right angle to magnetic induction is

A coil of 2000 turns and of mean radius 5 cm, makes 300 revolutions per minute around one of its diameters in a uniform magnetic field of induction 2.5 xx 10^-5 Wb/m^2 at right angles to its axis of rotation .Calculate the maximum e.m.f. induced in the coil and also its r.m.s. value.

A cycle wheel with 10 spokes each of length 0.5 m long is rotated at a speed of 18 km//hr in a plane normal to the earth’s magnetic induction of 3.6 xx 10^-5 T . Calculate the e.m.f. induced between the axle and rim of the cycle wheel

A meter gauge train is running towards north with speed of 20 m/s .The vertical component of earth's magnetic field is 3 xx 10^_4 (Wb)/m^2 . Calculate the e.m.f. induced at the end of the axle.