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an electro magnet is technology contain at least one permanent magnet

Explanation:

First of all we shall calculate mass of copper to be calculated from the formula below.

mass = volume x density

volume = total surface area x thickness of layer

= 12 x 12 x 2 x .01 cm³

= 2.88 cm³

mass = 2.88 x 9 = 25.92 g .

Let time required be t s .  .

charge flowing in time t = 1.5 t coulomb.

Given ,

1 coulomb deposits .00033 g of copper

1.5 t deposits    .00033 x 1.5 t g of copper

So ,

.00033 x 1.5 t = 25.92

t = 52364 s

= 14.54 hours.