For an L-C-R circuit, the power transferred from the driving source to the driven oscillator is P = I²Z cos ?.

(a) Here, the power factor cos ? > 0, P > 0

(b) The driving force can give no energy to the oscillator (P = 0) in some cases

(c) The driving force cannot syphon out (P < 0) the energy out of oscillator

(d) The driving force can take away energy out of the oscillator

A coil has resistance of 30 ohm and inductive reactance 20 ohm at 50 Hz frequency. If an ac source of 200 V, 100 Hz is connected across the coil, current in coil will be

Two bodies of mass 10 kg and 2 kg are moving with velocities m/s and m/s respectively. The velocity of their centre of mass is

A capacitor having capacitance of 100 µF is charged with a potential difference of 12 V is connected to an inductor of inductance 10 mH. Find the maximum current through the inductor.

In AC circuit with source voltage e = 20 sin 1000 t is connected to series L – R circuit whose power factor is $\frac{1}{\sqrt[]{2}}$ . If E = 25 sin 2000 t, the new power factor is

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