Question # 1

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

B2/2p is the expression of.

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Lenz's law

Magnetic energy

Magnetic energy density

Back emf

Electric current produces magnetic field, was suggested by.

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Faraday

Oersted

Henry

Lenz

The north pole of a magnet is brought near a metallic ring. The direction of induced current in the ring will be:

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Antoclockwise

Clockwise

First Clockwise and then Antoclockwise

First anticlockwise and then Clockwise

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

The winding of the electromagnet in motor are usually called.

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Magnetic coils

Field coils

Electric coils

electric o electric coils

Lenz's law presented in

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1834

1934

1826

1836

The motional emf developed in a conduction depends upon.

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Length

Orientation

Magnetic field

All of the above

Energy density in an inductor is.

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Directly proportional to magnetic field

Directly proportional to square of magnetic field

Inversely proportional to magnetic field

Inversely proportional to square of magnetic field

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

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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

Transformer is used to change

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Electric power

Magnetic field

Alternating voltage

Phase of A.C.

A 50 mH coil carries a current of 2.0 a , then energy stored in tis magnetic field is.

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0.1 J

10 J

100 J

1000 J

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

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Copper

Silicon

Iron

Aluminum

Commutator was invented in

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1834

1820

1840

1835

The self induction emf is some times called.

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Motional emf

Constant emf

Back emf

Variable emf

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