Experiments to study vision often need to track the movements of a subject\'s ey

Question

Experiments to study vision often need to track the movements of a subject's eye. One way of doing so is to have the subject sit in a magnetic field while wearing special contact lenses with a coil of very fine wire circling the edge. A current is induced in the coil each time the subject rotates his eye. Consider an experiment in which a 25-turn, 6.0-mm-diameter coil of wire circles the subject's cornea while a 1.1T magnetic field is directed as shown. The subject begins by looking straight ahead.

Explanation / Answer

at the initial position the coil is parallel to the B, therefore the flux is zero.
after the movement the flux is:

=A*B=N**r2*B*sin(4)=25**3e-3^2*1.1*sin(4)=54.24e-6 Q

to find emf we need to find that rate of change of the flux:

=-/t=54.24e-6/0.17=319e-6 V

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