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Five electric field lines are drawn coming out of a point charge of +5 nC. Using the same drawing convention, how many field lines should come out of a point charge of +20 nC?
A5 field lines
B10 field lines
C15 field lines
D20 field lines
Answer & Solution
Correct answer: D. 20 field lines
1. The number of field lines drawn from a charge is proportional to the size of that charge.
2. Going from +5 nC to +20 nC multiplies the charge by a factor of 4.
3. The number of field lines must be multiplied by the same factor of 4, giving 5 x 4 = 20 field lines.
_Source: OpenStax Physics (CC BY 4.0), Ch 18 "Static Electricity", section 18.3 Electric Field_
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