Question

copper sphere contains about 2×10^22 atoms.what fraction of the e^- must be removed from the sphere to give it a charge of two microcouloumb

Answer 1

Answer:

Given a mass of copper slab =2g contains 2×10

22

atoms.

Charge on nucleus of each atom =29e

We have to find the fraction of electrons that must be removed from sphere to give it +2μC charge.

We solve it as follows:

Total number of electrons in sphere =29×2×10

22

Number of electrons =

e

q

=

1.6×10

−19

2×10

−6

=1.25×10

13

Fraction of electrons removed =

Totalnumberofelectronsinsphere

1.25×10

13

=

29×2×10

22

1.25×10

13

=2.16×10

−11

Explanation:

here is your answer.!!