How long would it take a current of 20 A to coat uniformly 0.1 mm copper thick on both sides of a 10

Question

How long would it take a current of 20 A to coat uniformly 0.1 mm copper thick on both sides of a 10 cm × 16 cm copper plate

[e.c.e. of copper = 0.000331 gC⁻¹, density of copper = 9 gcm⁻³]

Answer 1

How long would it take a current of 20 A to coat uniformly 0.1 mm copper thick on both sides of a 10 cm × 16 cm copper plate

[e.c.e. of copper = 0.000331 gC⁻¹, density of copper = 9 gcm⁻³]

Explanation

Both sides are coated, so area = 2 × 10 × 16 = 320 cm². Thickness = 0.1 mm = 0.01 cm. Volume = 3.2 cm³.

Mass = 3.2 × 9 = 28.8 g. From m = zIt: t = 28.8 ÷ (0.000331 × 20) = 4,350 s.

4,350 ÷ 3600 = 1.21 hrs.

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