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Question: If an object of mass 1 kg contains \(4 \times 10^{20}\)atoms. If one electron is removed from every ...

If an object of mass 1 kg contains 4×10204 \times 10^{20}atoms. If one electron is removed from every atom of the solid, the charge gained by the solid in 1 g is.

A

2.8C2.8C

B

6.4×10−2C6.4 \times 10^{- 2}C

C

3.6×10−3C3.6 \times 10^{- 3}C

D

9.2×10−4C9.2 \times 10^{- 4}C

Answer

6.4×10−2C6.4 \times 10^{- 2}C

Explanation

Solution

Here, Number of electrons removed = number of atoms in 1 g or n=4×1020103=4×1017n = \frac{4 \times 10^{20}}{10^{3}} = 4 \times 10^{17}

∴\thereforecharge, q=ne=4×1017×1.6×10−19Cq = ne = 4 \times 10^{17} \times 1.6 \times 10^{- 19}C

=6.4×10−2C= 6.4 \times 10^{- 2}C