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Amit Saxena Grade: upto college level
`        A brass plate having surface area 200 cm^2 on one side is electroplated with 0.10 mm thick silver layers on both sides using a 15 A current. Find the time taken to do the job. The specific gravity of silver is 10.5 and its atomic weight is 1.07.9 g/mol.`
3 years ago

Navjyot Kalra
654 Points
```										Sol. I = 15 A Surface area = 200 cm^2 , Thickness = 0.1 mm
Volume of Ag deposited = 200 × 0.01 = 2 cm^3 for one side
For both sides, Mass of Ag = 4 × 10.5 = 42 g
Z base Ag = E/F = 107.9/96500 m = ZIT
⇒ 42 = 107.9/96500 *15*T ⇒ T = 42 * 96500/107.9 * 15 = 2504.17 sec = 41.73 min = 42 min

```
3 years ago
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