n a coil of resistance 100  a current is induced by changing the magneticflux through it. The variation of current with time is as shown in the figure. Themagnitude of change in flux through coil is(a) 200 Wb (b) 275 Wb (c) 225 Wb (d) 250 Wb

A coil having n turns and resistance RΩ is connected with a galvanometer of resistance 4RΩ. This combination is moved in time t seconds from a magnetic field W1 weber to W2 weber. The induced current in the circuit is

The magnetic flux linked with a coil at any instant 't' is given by ϕ = 5t3 – 100t + 300, the e.m.f. induced in the coil at t = 2 second is :-–40 V40 V140 V300 V

The magnetic flux linked with a coil changes by 2×10-2Wb when the currentchanges by 0.01A. The self inductance of the coil is

Two coils are placed near each other, and one is on top of the other one. The magnetic flux through thetop coil changes due to a varying current in the coil.(a) Suppose the magnetic flux through the top coil increases at a uniform rate of 0.3 Wb/s, what is theinduced emf in the bottom coil? Is it constant with time?(b) Suppose the magnetic flux through the top coil decreases at a varying rate of 0.5t Wb/s, what is theinduced emf in the bottom coil? Is it constant with time? What happens to the direction of thecurrent in the bottom coil, as compared with part a)?(c) Suppose that the current described in part a) is in the bottom coil rather than the top one. What isthe induced emf in the top coil?

A coil of wire enclosing an area 100 cm2 is placed with its plane making an angle 60º with the magnetic field ofstrength 10-1T. What is the flux through the coil? If magnetic field is reduced to zero in 10-3 s, then find the inducedemf