20% part (a) use an "e field sensor" and move it along either equipotential. what can you say about the e field along an equipotential?
a. varies in magnitude and direction, parallel to the equipotential.
b. constant magnitude, but varying direction, perpendicular to the equipotential.
c. varies in magnitude and direction, perpendicular to the equipotential.
d. constant direction, but varying magnitude, perpendicular to the equipotential.
e. constant direction, but varying magnitude, parallel to the equipotential.
f. constant magnitude, but varying direction, parallel to the equipotential.