| 1. | The core of a coil has a length of 200 mm. The inductance of coil is 6 mH. If the core length is doubled, all other quantities, remaining the same, the inductance will be ? | |
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3 mH
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12 mH
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24 Mh
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48 mH
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Report Question| 2. | The property of coil by which a counter e.m.f. is induced in it when the current through the coil changes is known as ? | |
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self-inductance
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mutual inductance
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series aiding inductance
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capacitance
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| 3. | ln an iron cored coil the iron core is removed so that the coil becomes an air cored coil The inductance of the coil will ? | |
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increase
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decrease
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remain the same
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initially increase and then decrease
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| 4. | An e.m.f of 16 volts is induced in a coil of inductance 4H. The rate of change of current must be ? | |
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64 A/s
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32 A/s
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16 A/s
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4 A/s
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| 5. | Which of the following circuit element stores energy in the electromagnetic field ? | |
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Inductance
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Condenser
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Variable resistor
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Resistance
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| 6. | A coil with negligible resistance has 50 V across it with 10 mA. The inductive reactance is ? | |
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50 ohms
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500 ohms
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1000 ohms
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6000 ohms
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| 7. | A conductor carries 125 amperes of current under 60ยบ to a magnetic field of 1.1 tesla. The force on the conductor will be nearly ? | |
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50 N
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120 N
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240 N
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480 N
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| 8. | For a purely inductive circuit which of the following is true ? | |
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Apparent power is zero
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Relative power is zero
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Actual power of the circuit is zero
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Any capacitance even if present in the circuit will not be charged
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