Question # 1

By winding the coil around a less magnetic core, self induction.

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Will increase

Will decrease

Remain same

First increase then decrease

The Lenz's law fulfils.

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Law of conservation of energy

Law of conservation of charge

Law of conservation of momentum

Kirchhoff's law

If we make magnetic field stronger the value of induced current is.

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Decreased

Increased

Vanishes

Remain constant

If a step up transformer were 100% efficient the primary and secondary winging's would have the same.

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Current

Power

Voltage

Direction of winding

Energy stored in inductor is.

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1/2 L I²

1/2 LI

1/2 L2I

1/2 L2I2

Lenz's law is a consequence of the law of conservation of

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Charge

Momentum

Energy

Angular momentum

Output of D.C. motor is

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A.C. energy

Mechanical energy

Chemical energy

D.C. energy

Michael Faraday and Joseph Henry belongs to

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England and USA

France and USA

China and USA

None of these

The mutual inductance between two coils depends upon their

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Size

Core material

Size, core material and separation

Separation

With the speed of motor, magnitude of back emf

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Remain same

Increase

Decrease

First increases then decreases

When back emf in motor is zero, it draws.

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Zero current

Minimum current

Maximum current

Steady current

Eddy current is one cause energy loss in

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A.C. generator

Transformer

D.C. motor

D.C. generator

A real transformer does not change.

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Voltage level

Current level

Power level

Frequency

Lenz's law was given by Heinrich lenz in:

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1894

1904

1854

1834

A.C. Generator based upon the

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Lenz's law

Maxwell's relation

Faradays law of electromagnet induction

Mutual induction

The winding of the electromagnet in motor are usually called.

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Magnetic coils

Field coils

Electric coils

electric o electric coils

Self induction does not depend on

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Number of turns of the coil

Area of cross section of the core

Nature of material of the core

Current through inductor

Electromagnetic induction is exactly according to law of:

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Momentum

Charge

Energy

Mass

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Physics ICS Part 2 Chapter 15 Online MCQ's Test MCQs With Answers

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