Two point charges,separated by 1.1 cm,have charge values of +2.0 and −4.0 µC,respectively.Suppose we determine that 10 field lines radiate out from the +2.0-µC charge.If so,what might be inferred about the −4.0-μC charge with respect to field lines?

Question

Two point charges,separated by 1.1 cm,have charge values of +2.0 and −4.0 µC,respectively.Suppose we determine that 10 field lines radiate out from the +2.0-µC charge.If so,what might be inferred about the −4.0-μC charge with respect to field lines?
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Quizplus · Accepted Answer

The number of field lines is proportional to the magnitude of the charge. Since the -4.0 µC charge is twice the magnitude of the +2.0 µC charge, it will have twice as many field lines, but they will radiate inwards. Hence, 20 field lines radiate in.

Two Point Charges,separated by 1