Regarding the two questions at the end of the packet:
First question. Consider the distance between two equipotential lines that differ by 1/2 a volt. If the field is weak this distance would be large. If the field is strong the distance would be small. Since field lines are supposed to be closer together where the field is strong, equipotential lines would be closer together, provided that each equipotential line is a constant delta V higher ( or lower) than the next, wherever the field lines are closer together.
Ignore the second question.
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