The earth is assumed to be a sphere of radius R. A platform is arranged at a height R from the surface of the earth. The escape velocity of a body from this platform is […]
A coil of inductive reactance 31 Ω has a resistance of 8 Ω. It is placed in series with a condenser of capacitative reactance 25 Ω. The combination is connected to an a.c. source of […]
The potential energy of a long spring when stretched by 2 cm is U. If the spring is stretched by 8 cm the potential energy stored in it is
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(a) U/4 (b) […]
The time of reverberation of a room A is one second. What will be the time (in seconds) of reverbation of a room, having all the dimensions double of those of room A?
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In producing chlorine through electrolysis 100 watt power at 1125 V is being consumed. How much chlorine per minute is liberated? E.C.E. of chlorine is 0.367×10⁻⁶kg/coulomb
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(a) 13.6 mg (b) 17.6 mg […]
Two coils of self inductance 2 mH and 8 mH are placed so close together that the effective flux in one coil is completely linked with the other. The mutual inductance between these coils is […]
A transistor is operated in common emitter configuration at constant collector voltage Vc = 1.5 V such that a change in the base current from 100 µA to 150 µA produces a change in the […]
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