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In a solid metal , there are 16 xx 10^(2...

In a solid metal , there are `16 xx 10^(21)` atoms. If from 0.5 % of atoms of solid, one electrons is extracted, then solid will have

A

12.8 C negative charge

B

12.8 C positive charge

C

13.8 C negative charge

D

13.8 C positive charge

Text Solution

Verified by Experts

The correct Answer is:
B
According to question,
`0.5%` of `16 xx 10^(21)`
`= (16 xx 10^(21) xx 0.5)/( 100) = 8 xx 10^(19)`
Hence, electrons are ejected from `18 xx 10^(19)` toms of elements.
`therefore` Negative charge ejected from conduction
`= 8 xx 19^(19) xx 1.6 xx 10^(-19)`
`= 12.8`C
`therefore` Charge on the solid Is 12.8 C positive charge.
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