A coil has N turns enclosing an area of A. In a physics laboratory experiment, t

Question

A coil has N turns enclosing an area of A. In a physics laboratory experiment, the coil is rotated during the time interval t from a position in which the plane of each turn is perpendicular to Earth's magnetic field to one in which the plane of each turn is parallel to the field. The magnitude of Earth's magnetic field at the lab location is B.

Part A

What is the magnitude initial of the magnetic flux through the coil before it is rotated?

Part B

What is the magnitude  final of the magnetic flux through the coil after it is rotated?

Explanation / Answer

Expression for magnetic flux linked with coil:

= BA sin

Here, is angle between magnetic field vector and area vector

( a )

Before rotated, the angle between B and A is 90 degree . Hence flux

= BA sin 90 = B.A

In this case, flux is maximum

( b)

When it rotated 90 degree, the area is parallel to flux, hence no flux cross the area,

In this case, angle is 0 degree

= BA sin 0 = 0

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