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Q1. | Two 300 µH coils in series without mutual coupling have a total inductance of |

A. | 300 µH [Wrong Answer] |

B. | 600 µH [Correct Answer] |

C. | 150 µH [Wrong Answer] |

D. | 75 µH [Wrong Answer] |

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Explanation:-
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**Also Read Similar Questions Below :**

⇒ A 200 turn coil has an inductance of 12 mH. If the number of turns is increased to 400 turns, all other quantities (area, length etc.) remaining the same, the inductance will be

6 mH

14 mH

24 mH

48 mH

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

300 µH

600 µH

150 µH

75 µH

⇒ Which circuit element(s) will oppose the change in circuit current?

Resistance only

Inductance only

Capacitance only

Inductance and capacitance

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

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variation in voltage to the coil

change of number of turns of coil

the resistance of magnetic path

⇒ The law that the induced e.m.f. and current always oppose the cause producing them is due to

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Lenz

Newton

Coulomb

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

Inductance

Condenser

Variable resistor

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⇒ The inductance df a coil will increase under all the following conditions except

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

⇒ Which of the following inductor will have the least eddy current losses?

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mutual inductance between two coils only

mutual inductance and self inductance of two coils

none of the above

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

Apparent power is zero

Relative power is zero

Actual power of the circuit is zero

Any capacitance even if present in the circuit will not be charged

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induced current

charge

enery

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⇒ An open coil has

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infinite resistance and zero inductance

infinite resistance and normal inductance

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greater the flux produced by it

longer the dela' in establishing steady current through it

⇒ In case all the flux from the current in coil 1 links with coil 2, the co-efficient of coupling will be

2.0

1.0

0.5

zero

⇒ 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

10 V

15 V

25 V

50 V

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Lenz's law

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⇒ 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

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⇒ Which of the following circuit elements will oppose the change in circuit current?

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⇒ Which of the following is unit of inductance?

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5 H

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⇒ A coil induces 350 mV when the current changes at the rate of 1 A/s. The value of inductance is

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250 mH

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⇒ A crack in the magnetic path of an inductor will result in

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increased inductance

zero inductance

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

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quadrupled

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NI/Φ

NΦ/I

NI

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

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the laminations are stacked vertically