A metal cube of side 5 cm is charged with 6 μC. The surface charge density on the cube is:
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A metal cube of side 5 cm is charged with 6 μC. The surface charge density on the cube is:

G1 Physics · Accepted Answer

Step 1: Total outside area of a cube = 6a². Step 2: With a = 0.05 m, A = 6(0.05)² = 0.015 m². Step 3: Average surface charge density σ = Q/A = (6 × 10⁻⁶)/0.015 = 4 × 10⁻⁴ C m⁻² = 0.4 × 10⁻³ C m⁻².