What is the inductive reactance of a coil if the current through it is 80 m A and voltage across it is 40 V ?

An electric motor which is loaded has an effective resistance of 30Omega and an inductive reactance of 40Omega . If the motor is powered by a source with a maximum voltage of 420 V, the maximum current is

What is the self -inductance of a coil which produce 5 V when the current changes from 3 A to 2 A in one millisecond ?

Assertion : The inductive reactance limits amplitude of the current in a purely inductive circuit. Reason : The inductive reactance is independent of the frequency of the current.

If the switches S_1,S_2, and S_3 fig. are arranged such that the current through the battery is minimum, fing the voltage across points A and B (in V)

A 20volts AC is applied to a circuit consisting of a resistance and a coil with negligible resistance. If the voltage across the resistance is 12V , the voltage across the coil is

Assertion: current sensitivity of a galvanometer is directly proportional to the current through the coil. Reason: Voltage sensitivity is inversely proportional to voltage.

A coil is series with a 20muF capacitor across a 230V, 50Hz supply. The current taken by the circuit is 8A and the power consumed is 200W. Calculate the inductance of the coil if the current in the circuit is (a) leading (b) lagging

What is meant by the time constant of an LR circuit? When the current flowing through a coil P decreases from 5 A to 0 in 0.2 seconds, an emf of 60 V is induced across the terminals of an adjacent coil Q. Calculate the coefficient of mutual inductance of the two coils P and Q.

In an L-C-R series circuit, the potential difference between the terminals of the inductance is 60 V, between the terminals of the capacitor is 30 V and that across the resistance is 40 V. Then, the supply voltage will be equal to

A virtual current of 4A and 50Hz flows in an AC circuit contaning a coil. The power consumed in the coil is 240W .If the virtual voltage across the coil is 100v then its inductance will be