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qUESTIONS

A 120 V a.c. source is connected across a pure inductor of inductance 0.70 H. If the frequency of the source is 60 Hz, the current passing through the inductor is (Neglect spin motion): (Taken π = 22/7)

In an a. c. circuit I = 100 sin 200 πt. The time required for the current to achieve its peak value will be:

In LCR circuit the inductance is changed from ‘L’ to ‘5L’, for same resonant frequency the capacitance should be changed from C to:

The source of alternating emf is connected to pure inductor only, then which one of following is the correct statements?

If maximum energy is stored in a capacitor at t = 0 then find the time after which, the current in the circuit will be maximum for the first time:

A series L-R circuit has impedance ‘Z’ when a.c. source is connected across it. Now, a capacitance is connected in series with L and R in the circuit. The new impedance of the circuit

The peak value of an alternating e.m.f. given as E = E0 sin wt is 10 V and frequency is 50 Hz. At time t = (1/600) * s instantaneous value of e.m.f. is (sin 30 deg = 0.5 = cos 60 deg)

According to newton’s law of viscosity, for a stream line flow, viscous force (F) between any two layer is:(A = area of layer)

Two small drops of mercury coalesce to form a single large drop. The ratio of total surface energy before and after the change is:

A capillary tube of radius ‘r’ is immersed in water and water rises to height “h”. The mass of water in the capillary tube is ‘M’. Another capillary of radius ‘2r’ is immersed in water. The mass of water that will rise in this tube is ‘M1’. The ratio M/M1 is:

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