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

JAMB Physics 2023 286 views
Source: JAMB · 2023

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]

  1. 1.54 hrs
  2. 2.43 hrs
  3. 1.89 hrs
  4. 1.21 hrs ✓

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