Question # 1

In A.C. inductor behaves as

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Capacitor

Resistor

Commutator

Transistor

The current induced can be increased by:

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Using a stronger magnetic field

Moving the loop faster

Replacing the loop bay coi of many turns

All of above

When the back emf is zero, its draws.

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Zero current

Minimum current

Maximum current

Steady current

The Lenz's law is also statement of:

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Law of conservation of mass

Law of conservation of charge

Law of conservation of energy

Law of conservation of momentum

The illustration of the phenomenon of mutual induction is in the device of

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Transformer

Inductor

A.C. Generator

Ammeter

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

A real transformer does not change.

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Voltage level

Current level

Power level

Frequency

The movement of conductor in magnetic field produces electrical current was discovered in:

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1931

1731

1842

1831

A.C. Generator based upon the

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Lenz's law

Maxwell's relation

Faradays law of electromagnet induction

Mutual induction

The induction can be increased by winding the wire around a core made of.

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Copper

Silicon

Iron

Aluminum

The direction of induced current is always so as to oppose the change which causes the current is:

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Faraday's law

Lenz's law

Ohm's law

Kirchhoff's 1st rule

If the north pole of a magnet moves away from a metallic ring

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Clockwise

Anticlockwise

First clockwise and then anticlockwise

None of above

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Electromagnetic induction is exactly according to law of:

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Momentum

Charge

Energy

Mass

The only difference between the construction of D.C and A.C is.

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Carbon burshes

Coil

Commutator

Magnetic field

Step up transformer is used.

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Step up D.C. voltage

Step up A.C. voltage

Step up both A.C and D.C.

Step up A.C. current

If magnetic field is doubled then magnetic energy density becomes.

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Four times

Two times

Three times

Six times

In self induction A coil is connected in__________ with battery and a rheostat.

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Parallel

Series

Both A and B

None of above

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