The eye has a modest dipole moment, with the cornea positive and the back of the eye negative. This dipole moment rotates with the eyeball. If electrodes are placed on either side of the eye, as in P21.34a, the potential difference between the electrodes can be used to measure the orientation
of the eye. A record of this potential is known as an electrooculogram;
it’s similar in principle to the electrocardiogram.
a. P21.34b is a top view showing the eyeball pointed straight ahead. For this case, is the potential difference V2 - V1 positive, negative, or zero?
b. P21.34c is a top view showing the eyeball pointed to the right. For this case, is the potential difference V2 - V1 positive, negative, or zero?
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