Electromagnetic...

Two coils, A and B, are lined such that emf $$\epsilon$$ is induced in B when the current in A is changing at the rate $$I$$. If $$i$$ current is now made to flow in B, the flux linked with A will be :

Coils in the resistance boxes are made from doubled up insulated wires

If a current increases from zero to one ampere in 0.1 second in a coil of 5 mH, then the magnitude of the induced e.m.f. will be

The SI unit of inductance, the henry can be written as

A copper ring is suspended by a thread in a vertical plane. If one end of a magnet is brought horizontally towards the ring in plane of ring as shown, the ring will

A generator has an e.m.f. of 440 volt and internal resistance of 400 ohm. Its terminals are connected to a load of 4000 ohm. The voltage across the load is:

A rectangular coil of single turn, having area A, rotates in a uniform magnetic field B with an angular velocity $$\omega$$ about an axis perpendicular to the field. If initially the plane of the coil is perpendicular to the field, then the average induced emf when it has rotated through $$90^o$$ is:

A coil has 200 turns and area of $$70 cm^2$$. The magnetic field perpendicular to the plane of the coil is $$0.3 Wb/m^2$$ and take 0.1 sec to rotate through $$180^o$$. The value of the induced e.m.f. will be

According to Faraday's law of electromagnetic induction:

If coefficient of self induction of a coil is 1 H, an e.m.f. of 1 V is induced, if