An armature coil consists of 20 turns of wire, each of area `A = 0.09 m^2` and total resistance 15 ohm . It rotates in a magnetic field of 0.5 T at a constant frequency of `150//pi`. Calculate the value of maximum induced e.m.f. produced in the coil.

An armature coil consists of 20 turns of wire, each of area A = 0.09 m^2 and total resistance 15 ohm . It rotates in a magnetic field of 0.5 T at a constant frequency of 150//pi . Calculate the value of average induced e.m.f. produced in the coil.

A 100 turn coil of area 0.1 m^(2) rotates at half a revolution per second. It is placed in a magnetic field of 0.01 T perpendicular to the axis of rotation of the coil. Calculate the maximum voltage generated in the coil.

An a.c. generator consists of a coil of 2,000 turns each of area 80 cm^2 and rotating at an angular speed of 200 r.p.m. in a uniform magnetic field of 4.8 xx 10^-2 T. Calculate the peak and r.m.s. value of e.m.f induced in the coil.

A rectangular coil 25 cm xx 10 cm and having 700 turns rotates about an axis at right angles to a magnetic field of 20 gauss at 1,500revolutions per minute. Calculate the maximum vlaue of the e.m.f. generated in the coil.

A circular coil of wire consisting of 100 turns, each of radius 8.0 cm carries a current of 0.40 A. What is the magnitude of the magnetic field B at the centre of the coil?

A closely wound rectangular coil of 200 turns and size 0.3 m xx 0.1 m is rotating in a magnetic field of induction 0.005 Wb m^-2 with a frequency of 1,800 r.p.m. about an axis normal to the field. Calculate the maximum value of induced e.m.f.

A flat coil of 500 turns each of area 50 cm^(2) rotates in a uniform magnetic field of 0.14 Wb//m^(2) at an angular speed of 150 rad//sec . The coil has a resistance of 5 Omega. The induced e.m.f. is applied to an external resistance of 10 ohm. Calculate the peak current through the resistance.

A circular coil of wire consisting of 80 turns, each of radius 8 cm, carries a acurrent of 0.5 A. Calculate the magnitude of magnetic field B at the centre of the coil.

An a.c. generator consists of a coil of 100 turns and cross sectional area of 3 m^(2) , rotating at a constant angular speed of 60 rad//sec in a uniform magnetic field of 0.04 T. The resistance of the coil is 500 Omega . Calculate maximum current drawn from the generator.