A coil of resistance and 1.0 H inductance is connected to an a.c. source of frequency 200/2π Hz. Phase angle between potential and current will be
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(a) 0⁰ (b) 30⁰ (c) 90⁰ […]
Electromagnetic induction is not used in
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(a) speedometer (b) transformer (c) AC generator (d) room heater
Correct Answer:
room heater
Explanation:
No explanation available. Be the first to write the explanation for […]
A solenoid of length l metre has self inductance L henry. If number of turns are doubled, its self inductance
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(a) Becomes 2 L henry (b) Becomes 4 L henry (c) Remains […]
A short circuited coil is placed in a magnetic field varying with time. Electrical power is dissipated due to the current induced in the coil. If the number of turns were to be quadrupled and […]
A coil of resistance 10 Ω and an inductance 5 H is connected to a 100 volt battery. The energy stored in the coil is
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(a) 250 erg (b) 250 J (c) 125 […]
A horizontal straight conductor kept in north-south direction falls under gravity. Then
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(a) No e.m.f. is induced along the length of conductor (b) A current will be induced from south to north […]
A coil of N turns and mean cross-sectional area A is rotating with uniform angular speed ω about an axis at right angle to uniform magnetic field B. The induced e.m.f. E in the coil […]
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 […]
A device which converts electrical energy into mechanical energy is
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(a) Electric motor (b) Induction coil (c) Dynamo (d) Generator
Correct Answer:
Electric motor
Explanation:
No explanation available. Be the first to […]
A coil of 100 turns carries a current of 5 mA and creates a magnetic flux of 10⁻⁵ Wb. The inductance is
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(a) 0.2 mH (b) 0.3 mH (c) 2.0 mH (d) […]
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