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 that have 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 20 turn, 6.0 a-mm-diameter coil of wire circles the subject's cornea while a 1.4 T magnetic field is directed as shown in the figure. The subject begins by looking straight ahead.(Figure 1

What emf is induced in the coil if the subject shifts his gaze by 7.0 ? in 0.20 s ?

Express your answer using two significant figures.

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 that have 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 20 turn, 6.0 a-mm-diameter coil of wire circles the subject's cornea while a 1.4 T magnetic field is directed as shown in the figure. The subject begins by looking straight ahead. (Figure 1 of 1 Figure 1 Cornea 6.0-mm-diameter coil Eye Part A What emf is induced in the coil if the subject shifts his gaze by 7.0 n 0.20 s Express your answer using two significant figures. Submit My Answers Give U incorrect; Try Again Provide Feedback Continue

Explanation / Answer

magnetic flux = N*B*A*theta

emf = N*(d/dt)*B*A*costheta

emf = N*B*A*(costheta2 - costheta1 )/t

e = 20*1.4*pi*0.003^2*(cos7)/0.2

e = 0.0039 v

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