A circular coil of mean radius of `7 cm` and having `4000` turns Is rotate at the rate of `1800` revolution per minute in the earth 's magnetic field (B=0.5 gauss), the maximum e.m.f. induced in coil will be

A coil of area 80 square cm and 50 turns is rotating with 2000 revolution per minut about an axis perpendicular to a magnetic field field of 0.05 Telsa. The maximum value of the e.m.f. developed in it is

A coil of N turns and area A is rotated at the rate of n rotations per second in a magnetic field of intensity B, the magnitude of the maximum magnetic flux will be __

A rectangular coil of area A , having number of turns N is rotated at 'f' revoluation per second in a uniform magnetic field B , the field being perpendicular to the coil. Prove that maximum emf induced in the coil is 2pifNBA .

A circular coil of radius 0.2 m having 2000 turns rotates with a uniform speed of 100 rpm in a uniform magnetic field of 0.2 T. The r.m.s. value of the induced voltage is

A circular coil of radius 10 cm having 100 turns carries a current of 3.2 A. The magnetic field at the center of the coil is

A circular coil of radius 10 cm having 100 turns carries a current of 3.2 A. The magnetic field at the center of the coil is

(a) Explain the meaning of the term mutual inductance. Consider two concentric circular coils, one radius r_(1) and the other of radius r_(2)(r_(1) lt r_(2)) placed coaxially with centres coinciding with each other. Obtain the expression for the mutual inductance of the arrangement. (b) A rectangular coil of area A , having number of turns N is rotated at 'f' revoluation per second in a uniform magnetic field B , the field being perpendicular to the coil. Prove that maximum emf induced in the coil is 2pifNBA .

A rectangular coil has 60 turns and its length and width is 20 cm and 10 cm recpectively . The coil rotates at a speed of 1800 rotation per minute in a uniform magnetic field of 0.5 T about its one of the diameter. The maximum induced emf will be :-