Electromagnetic Induction | Test For NTS PPSC FPSC, TEST

A. fluctuates off and on
B. varies in magnitude alone
C. changes its direction again and again
D. changes its magnitude continuously and reverses its direction of flow after regularly recurring intervals.

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Category: Electromagnetic Induction

A coil of wire is arranged with its plane perpendicular to a uniform magnetic field o flux density B. when the radius of the coil increases from r1 to r2 in time Δt then what is the emf induced in the coil ?

Which one of the following functions like a motor ?

The core of a coil has a length of 200 mm. The inductance of coil is 6 mH. If the core length is doubled, all other quantities, remaining the same, the inductance will be_____________?

Two coils have self-inductances of 10 H and 2 H, the mutual inductance being zero. If the two coils are connected in series, the total inductance will be_____________?

Which of the following uses electric energy and does not convert it into any other form ?

An alternating current or voltage________________?

Long distance transmission is easy for________________?

Self-inductance of a long solenoid is______________?

An average voltage of 10 V is induced in a 250 turns solenoid as a result of a change in flux which occurs in 0.5 second. The total flux change is____________?

Which one of the following devices does not function like an electric motor ?