Electromagnetic...

The mutual inductance between a primary and secondary circuits is 0.5 H. The resistances of the primary and the secondary circuits are 20 ohms and 5 ohms respectively. To generate a current of 0.4 A in the secondary, current in the primary must be changed at the rate of

The square root of the product of inductance and capacitance has the dimension of

If the current is halved in a coil, then the energy stored is how much times the previous value?

An inductor of inductance L = 400 mH and resistors of resistances R₁ = 2 Ω and R₂ = 2 Ω are connected to a battery of e.m.f. 12 V as shown in the figure. The internal resistance of the battery is negligible. The switch S is closed at t = 0. The potential drop across L as a function of time is

A coil of inductance 300 mH and resistance 2 Ω is connected to a source of voltage 2V. The current reaches half of its steady state value in

Which of the following is a wrong statement?

A coil has an inductance of 2.5 H and a resistance of 0.5 r. If the coil is suddenly connected across a 6.0 volt battery, then the time required for the current to rise 0.63 of its final value is

When the number of turns and the length of the solenoid are doubled keeping the area of cross-section same, the inductance

The mutual inductance of an induction coil is 5H. In the primary coil, the current reduces from 5A to zero in 10^–3 s. What is the induced e.m.f. in the secondary coil?

The self-inductance of a straight conductor is