Electromagnetic Induction Quiz 1 – Punjab Meritorious School Preparation Portal

Welcome to your 26th Sep Electromagnetic Induction Quiz 1 CBT TEST

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A voltmeter is connected across the terminals of a dc motor joined to a suitable battery. When the motor is used to rotate a machine X and current flows, the volt meter -

reads the e.m.f. of the battery

reads the back e.m.f. in the motor

reading is a measure of the power supplied toX

reads the energy per coulomb supplied to X

A copper disc of radius 0.1 m is rotated about its centre with 20 revolution per second in a uniform magnetic field of 0.1 T with its plane perpendicular to the field. The emf induced across the radius of the disc is -

Zero

2BvR

4BvR

None of these

10 mH

15 mH

25 mH

5 mH

A superconducting loop of radius R has self inductance L. A uniform and constant magnetic field B is applied perpendicular to the plane of the loop. Initially current in this loop is zero. The loop is rotated by 180º. The current in the loop after rotation is equal to -

Rate of increment of energy in an inductor with time in series LR circuit getting charge with battery of e.m.f. E is best represented by : [inductor has initially zero current ]

In a LR circuit connected to a battery the rate at which energy is stored in the inductor is plotted against time during the growth of current in the circuit. Which of the following best represents the resulting curve ?

M will repel R when it is moving towards R

M will attract R when it is moving towards R

M will repel R when moving towards as well as away from R

M will attract R when moving towards as well as away from R

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