Question # 1

B2/2p is the expression of.

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Lenz's law

Magnetic energy

Magnetic energy density

Back emf

The negative sign with induced emf in Faraday's law is in accordance with

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Lenz's law

Amperes law

Boyle's law

Gauss law

A metal rod of 1 m is moving at a speed of 1 ms-1 in a direction making an angle 30^o with 0.5 T magnetic field . The emf produced is.

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0.25 N

2.5 N

0.25 V

2.5 V

When back emf in motor is zero, it draws.

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Zero current

Minimum current

Maximum current

Steady current

Which of the following quantities remain constant in step up transformer?

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Current

Voltage

Power

Heat

The emf induced by the motion of a conductor across a magnetic field is called:

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Motional emf

Rotational emf

Induced emf

All of above

A.C is converted into D.C by

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Dynamo

Rectifier

Motor

Transformer

The induced emf in a coil is proportional to:

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Magnetic flux through the coil

Rate of change of Magnetic flux through the coil

Area of the coil

Product of magnetic flux flux and area of the coil

A simple device that prevents the direction of current from changing is called.

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Commutator

Rotor

Armature

Detector

The mutual inductance of the coils depends upon.

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Stiffness of the coils

Density of coils

Material of coils

Geometry of the coils

Michael Faraday and Joseph Henry belongs to

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England and USA

France and USA

China and USA

None of these

1 Henry =

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VSA^-1

VS^-1A^-1

V^-1SA

VSA^-2

Mutual induction play role in.

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Generator

D.C. motor

Galvanometer

Transformer

The jerks in D.C. motor are created by the use of.

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Armature

Commutators

Split rings

Source of emf

Self inductance of a long solenoid is given by

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None of the above

Which one is not present in A.C. generator.

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Armature

Magnet

Slip rings

Commutator

Unit of self inductance is

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Weber

Tesla

Henry

Farad

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

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