You are using a voltmeter to measure the voltage at a particular point on an equipotential line, and the voltmeter reads 2 Volts. If you instead measure a different point on the same equipotential line, is it possible to know what the voltmeter should read? If so, what should it read?

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Two point charges are separated by a certain distance. how does the strength of the electric field produced by the first charge, at the position of the second charge, change if the second charge is doubled? a. the field does not change b. the field strength decreases by half. c. the field strength doubles d. the field strength quadruples