Electromagnetic...

Two coils A and B having turns 300 and 600 respectively are placed near each other, on passing a current of 3.0 ampere in A, the flux linked with A is 1.2 × 10^–4 weber and with B it is 9.0 × 10^–5 weber. Themutual inductance of the system is

An inductor L, a resistance R and two identical bulbs, B₁ and B₂ are connected to a battery through a switch S as shown in the figure. The resistance R is the same as that of the coil that makes L. Which of the following statements gives the correct description of the happenings when the switch S is closed

An air core solenoid has 1000 turns and is one metre long. Its cross-sectional area is 10 cm². Its self-inductance is

An inductance L and a resistance R are first connected to a battery. After sometime the battery is disconnectedbut L and R remain connected in a closed circuit. Thenthe current reduces to 37% of its initial value in

Why the current does not rise immediately in a circuit containing inductance

Two circular coils have their centres at the same point. The mutual inductance between them will be maximum when their axes.

In L – R circuit, for the case of increasing current, the magnitude of current can be calculated by using the formula

The current through choke coil increases from zero to6 A in 0.3 seconds and an induced e.m.f. of 30 V isproduced. The inductance of the coil of choke is

The resistance and inductance of series circuit are 5 Ω and 20 H respectively. At the instant of closing the switch, the current is increasing at the rate 4 A/s. Thesupply voltage is

The adjoining figure shows two bulbs B₁ and B₂, resistor R and an inductor L. When the switch S is turned off