In an LR circuit, reactance and resistance are equal. Calculate phase by which voltage differ current?

A 100 V - 50 Hz a.c. source is connected to a series combination of an inductance of 100 mH and a resistance of 25 ohm. Calculate the magnitude and phase of the current.

In the given circuit calculate the total resistance of the circuit.

An a.c. Voltage is applied to a resistance R=30 Omega and an inductor L in series. If the inductive reactance is also 30 Omega , the phase difference between the applied voltage and the current in the circuit is

When a series combination of inductance and resistance are conneted with a 10 V, 50 Hz a.c. source, a current of 1 A flows in the circuit. The voltage leads the current by a phase angle of pi//3 radian. Calculate the values of resistance and inductance.

A reactive element, in an a.c. circuit, causes the current flowing to lead in phase by pi/2 w.r.t applied voltage. Identify the element in this case.

A reactive element, in an a.c. circuit, causes the current flowing to lag in phase by pi/2 w.r.t applied voltage. Identify the element in this case.

A transistor has a current gain of 30. If the collector resistance is 6kOmega , input resistance is 1kOmega calculate its voltage gain.

The current sensitivity of a moving coil galvanometer increases by 20% , when its resistance is increased by a factor of two. Calculate by what factor, the voltage sensitivity changes.