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

Question

A coil has N_a turns enclosing an area of A. In a physics laboratory experiment, the coil is rotated during the time interval Deltat 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.

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

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

What is the magnitude of the average emf induced in the coil?

Explanation / Answer

magnetic flux f = NBA here N = number of turns of the coil B = initial magnetic field A = area of the each coil induced emf e = - df / dt Here f = NBA e = - df / dt = - ( fi - ff ) /t -0 ff = 0 since mgnetic field and plane of the coil are parallel e = -NAB / t

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