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The answer: C. amount of charge on the source charge
The field lines all represent the movements of field charges. The more crowded the field lines or the more density of electric field the higher is the magnitude of the source charge.
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The number or density of field lines on a source charge indicates the amount of charge on the source charge.
Answer: Option C
Explanation:
The source charge is the point from which the charge lines or the lines of energy will be started. So the number of lines emitted from the point charge or the source charge will indicate the strength of the source charge.
Also by measuring the density of the source charge i.e., the number of lines emitted per unit volume or the field lines which is the measure of lines emitted per unit area also indicate the strength of the source charge. So these strength are nothing but the amount of charge present in the source charge.