Question # 1

Energy density of an inductor is:

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UM=1/2μ_∘/B²

Um = 2μ_∘/B

UM = 1/2B²/μ_∘

Um = 2B²/μ_∘

B2/2p is the expression of.

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Lenz's law

Magnetic energy

Magnetic energy density

Back emf

When the back emf is zero, its draws.

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Zero current

Minimum current

Maximum current

Steady current

Which of the following converts electrical energy into mechanical energy.

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Transformer

A.C. generator

D.C. generator

D.C. motor

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

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

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

One henry is equal to

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1 ohm x 1 sec

1 ohm x 1 hertz

1 ohm x 1 metre

All of above

Commutator was invented by:

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William bills

William Gates

William tells

William Sturgeon

If D.C. input for step up transformer, the output is

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Zero

High

Low

May be high or low

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

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Armature

Commutators

Split rings

Source of emf

Efficiency of transformer does not affected by

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Input voltage

Core of transformer

Insulation between sheet

Resistance of coils

If magnetic field is doubled then magnetic energy density becomes.

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Four times

Two times

Three times

Six times

Mutual induction play role in.

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Generator

D.C. motor

Galvanometer

Transformer

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Electromagnetic induction obeys law of conservation

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Charge

Energy

Momentum

Mass

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Lenz's law

Faraday's law

Ampere's law

None of these

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