A coil is rotating between the magnetic poles of a generator. What is the angle

Question

A coil is rotating between the magnetic poles of a generator. What is the angle between the coil’s velocity vector and the magnetic field when the induced emf is maximum

A).45 B). 0 C) 30 D).90

What type of energy change takes place in a motor?

A). Electrical energy to mechanical energy    B.)Mechanical energy to electrical energy C). both D). none  

What orientation of a magnetic field will cause the magnetic flux through an area to be zero even though the magnetic field is not zero?

A).perpendicular to the area B).parallel to the area C). at the angle of the area D).none

A). Electrical energy to mechanical energy    B.)Mechanical energy to electrical energy C). both D). none  

What orientation of a magnetic field will cause the magnetic flux through an area to be zero even though the magnetic field is not zero?

A).perpendicular to the area B).parallel to the area C). at the angle of the area D).none

Explanation / Answer

Expression for induced emf

E = NBA sin

It will be maximum whern = 90 degree, since sine ratio has maximum value at 90 deg, that is sin 90 = 1

E = NBA

Thus, the correct option is ( D )

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In motors, Electrical energy to mechanical energy. Therefore, the correct option is ( A )

When area is parallel to flux, then the magnetic flux through an area to be zero even though the magnetic field is not zero.

It is maximum when flux is perpendicular to the area

Thus, the correct option is ( B )

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