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Electromagnetic Induction MCQs

Free 45+ Electromagnetic Induction MCQs for PPSC, FPSC, NTS, and Pakistan government job tests. Practise below with answers and explanations.

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Electromagnetic Induction — MCQs for Pakistan government job tests

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Electromagnetic Induction

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1.Can the left-hand generator rule be used to identify the polarity of an induced voltage?

2.Will changing the direction of either the magnetic field or the current reverse the force acting on a conductor?

3.Is the self-inductance of a coil defined as the electromotive force (in volts) induced when the current changes at a rate of one Weber-turn per second?

4.Which component in a circuit resists changes in the current flow?

5.A coil is wrapped around an iron core carrying a current I. Which factor does NOT influence the self-induced voltage in the coil?

6.What is the effect of a fracture in the magnetic core of an inductor?

7.The coupling coefficient between two air-core inductors is determined by which of the following?

8.If the current in a coil increases from 8 A to 12 A within one second and induces an emf of 20 volts, what is the inductance of the coil?

9.A coil generates an induced voltage of 350 mV when the current varies at a rate of 1 A/s. What is the inductance of the coil?

10.Calculate the force exerted on a 3-meter-long conductor carrying a current of 50 A, positioned perpendicular to a magnetic field with a flux density of 0.67 T.

11.A solenoid with 250 turns experiences an average induced voltage of 10 V due to a flux change occurring over 0.5 seconds. What is the total change in magnetic flux?

12.What is the combined inductance of two 300 µH inductors connected in series without any mutual inductance?

13.Among the following types of inductors, which one experiences the lowest eddy current losses?

14.A solenoid with 500 turns generates an average induced voltage of 60 V. What is the duration of the flux change of 0.06 Wb required to produce this voltage?

15.A coil with almost zero resistance has a voltage of 50 V across it and carries a current of 10 mA. What is the value of its inductive reactance?

16.A wire carries a current of 125 amperes at an angle of 60° to a magnetic field with a strength of 1.1 tesla. What is the approximate force exerted on the wire?

17.A 2-meter-long conductor is moving perpendicular to a magnetic field with a flux density of 1 tesla at a speed of 12.5 m/s. What is the magnitude of the induced electromotive force (e.m.f.) in the conductor?

18.Two coils with self-inductances of 10 H and 2 H respectively are connected in series, and their mutual inductance is zero. What is the combined inductance of the series connection?

19.Lenz’s law is derived from the principle of conservation of which quantity?

20.What is the value of the coupling coefficient when the entire magnetic flux generated by coil 1 passes through coil 2?

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