Question # 1

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' s1ast rule

In D.C. generator, split rings act as.

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Capacitor

Commutator

Resistor

Inductor

A current generator device converts:

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Mechanical energy into chemical energy

Chemical energy into electrical energy

Mechanical energy into electrical energy

Both b and c

The motional emf depends upon the

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Length of conductor

Speed of conductor

Strength of magnet

All of these

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

Commutator was invented in

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1834

1820

1840

1835

Energy stored in inductor is.

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1/2 L I²

1/2 LI

1/2 L2I

1/2 L2I2

Energy density of an inductor is:

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UM=1/2μ_∘/B²

Um = 2μ_∘/B

UM = 1/2B²/μ_∘

Um = 2B²/μ_∘

A step up transformer is used 120 V line to provide 240 V. If primary coil has 100 turns the number of turns is secondary is.

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50

100

150

200

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Lenz's law

Faraday's law

Ampere's law

None of these

The motional emf is give by

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qvB

IBL

eBL

vBL

Lenz's law deals with

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Magnitude of emf

Direction emf

Direction of induced current

Resistance

Efficiency of transformer does not affected by

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Input voltage

Core of transformer

Insulation between sheet

Resistance of coils

When the back emf in a current is zero, it draws

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Zero current

Maximum current

Minimum current

Steady average current

In case of inductor , energy is stored in the

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Electric field

Magnetic field

Potential field

Gravitational field

In a coil current change from 2 to 4 A in .05 s . If the average induced emf is 8 V then coefficient of self-inductance is:

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0.2 henry

0.1 henry

0.8 henry

0.04 henry

The unit of induced emf is

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Ampere

Volt

Joule/coulomb

Both (b) and (c)

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

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Current

Voltage

Power

Heat

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