In a physics laboratory experiment, a coil with 200 turns enclosing an area of 12 cm2 is rotated in 0.040 s from a position where its plane is perpendicular to the earth’s magnetic field to a position where its plane is parallel to the field. the earth’s magnetic field at the lab location is 6.0×10−5 t. (a) what is the magnetic flux through each turn of the coil before it is rotated? after it is rotated? (b) what is the average emf induced in the coil?

To solve this problem it is necessary to apply the concepts related to the magnetic flow of a coil and take into account the angles for each case.

It is also necessary to delve into part C, the concept of electromotive force (emf) which is defined as the variation of the magnetic flux as a function of time.

By definition the magnetic flux is determined as:

Where

N = Number of loops We will calculate the value for each of the spins

B = Magnetic Field

A = Cross-sectional Area

Angle between the perpendicular cross-sectional area and the magnetic field.

PART A) The magnetic flux through the coil after it is rotated is as follows:

PART B) For the second case the angle formed is perpendicular therefore:

PART C) The average induced emf of the coil is as follows:

probably not the "magnets"in the magnet, so to speak, are thought to be electrons orbiting in shells. vurrent loops two sides to the loop