Question
A metal cube of side 5 cm is charged with 6 C . The surface charge density on the cube is
NEET
Physics
Electrostatics
2024
NEET 2024 (Re-NEET)
NEET Physics Question (2024) — Solution
Options
- A. 0.125 10^ -3 C m ^ -2
- B. 0.25 10^ -3 C m ^ -2
- C. 4 10^ -3 C m ^ -2
- D. 0.4 10^ -3 C m ^ -2
Answer
D. 0.4 10^ -3 C m ^ -2
Step-by-step solution
In metal all the charge is present on surface. Q=6 C Total surface area S=6 a^2 =6 (5 10^ -2 )^2 =6 25 10^ -4 =150 10^ -4 ~m ^2 Surface charge density = Q S = 6 10^ -6 150 10^ -4 =0.4 10^ -3 C m ^ -2
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