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Q1. | Both the number of turns and the core length of an inductive coil are doubled. Its self-inductance will be |

A. | unaffected [Wrong Answer] |

B. | doubled [Correct Answer] |

C. | halved [Wrong Answer] |

D. | quadrupled [Wrong Answer] |

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**Also Read Similar Questions Below :**

⇒ The co-efficient of coupling between two air core coils depends on

self-inductance of two coils only

mutual inductance between two coils only

mutual inductance and self inductance of two coils

none of the above

⇒ A coil with negligible resistance has 50 V across it with 10 mA. The inductive reactance is

50 ohms

500 ohms

1000 ohms

5000 ohms

⇒ Which of the following circuit element stores energy in the electromagnetic field?

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⇒ In case of an inductance, current is proportional to

voltage across the inductance

magnetic field

both (a) and (b)

neither (a) nor (b)

⇒ A laminated iron core has reduced eddy-current losses because

more wire can he used with less D.C. resistance in coil

the laminations are insulated from each other

the magnetic flux is concentrated in the air gap of the core

the laminations are stacked vertically

⇒ An averaVoltage of 10 V is induced in a 250 turns solenoid as a result of a change in flux which occurs in 0.5 second. The total flux change is

20 Wb

2 Wb

0.2 Wb

0.02 Wb

⇒ Find the force acting on a conductor 3m long carrying a current of 50 amperes at right angles to a magnetic field having a flux density of 0.67 tesla.

100 N

400 N

600 N

1000 N

⇒ An e.m.f. of 16 volts is induced in a coil of inductance 4 H. The rate of change of current must be

64 A/s

32 A/s

16 A/s

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⇒ The co-efficient of self-inductance for a coil is given as

NI/Φ

NΦ/I

NI

^{2}/Φ

NΦ/I

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⇒ A 500 turns solenoid develops an average induced voltage of 60 V. Over what time interval must a flux change of 0.06 Wb occur to produce such a voltage?

0.01 s

0.1 s

0.5 s

5 s

⇒ Lenz's law is a consecluence of the law of conservation of

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charge

enery

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Laminated iron core

Iron core

Powdered iron core

⇒ Two 300 µH coils in series without mutual coupling have a total inductance of

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600 µH

150 µH

75 µH

⇒ The magnitude of the induced e.m.f. in a conductor depends on the

flux density of the magnetic field

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amount of flux linkages

rate of change of flux-linkages

⇒ Current changing from 8 A to 12 A in one second induced 20 volts in a coil. The value of inductance is

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5 H

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⇒ The property of coil by which a counter e.m.f. is induced in it when the current through the coil chatiges is known as

self-inductance

mutual inductance

series aiding inductace

capacitance

⇒ Which of the following statements is cotrect ?

The inductance of the coil carrying a constant D.C. current will change the current into pulses

The inductance of the coil carrying a constant D.C. current will increase the current

The inductance of the coil carrying a constant D.C. current will not affect the current

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⇒ Which of the following is unit of inductance?

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Henry

Ampere turns

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⇒ A conductor 2 metres long moves at right angles to a magnetic field of flux densit 1 tesla with a velocity of 12.5 m/s. The induced e.m.f. in the conductor will be

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15 V

25 V

50 V

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⇒ For a purely inductive circuit which of the following is true ?

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greater the flux produced by it

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⇒ A coil is wound on iron core which carries current I. The self induced voltage in the coil is not affected by

variation in coil current

variation in voltage to the coil

change of number of turns of coil

the resistance of magnetic path

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aid the increasing current

tend to decrease the amount of current

produce current opposite to the increasing current

aid tite applied voltage

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when more length for the same number of turns is provided

when the number of turns of the coil increase

when more area for each turn is provided

when permeability of the core increases

⇒ A conductor carries 125 amperes of current under 60° to a magnetic field of 1.1 tesla. The force on the conductor will be nearly

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120 N

240 N

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