Physics
NULL
Medium
Question
A cube of side 5 cm has a charge of 6 C. The surface density of charge is_________?
A
100 C m –2
B
200 C m –2
C
300 C m –2
D
400 C m–2
✓ Official correct answer
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A
100 C m –2
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B
200 C m –2
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C
300 C m –2
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D
400 C m–2
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Explanation
A cube of side 5 cm (0.05 m) has total surface area 6 x (0.05)^2 = 0.015 m^2. Surface charge density = Q/A = 6/0.015 = 400 C/m^2.
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