Question

A pith ball having a charge of -1 uc . how many electron are removed from this pith ball to carry a net charge of +1uc.​

Answer 1

Explanation:

Correct option is

D

6.25×10

18

The Charge q on a body must always exist as an integral multiple of the fundamental unit charge e, the charge of an electron, where e=1.6×10

−19

C.

Thus for 1 coulomb of charge the body will hold 1/1.6×10

−19

=6.25×10

18

electrons.

Answer 2

Answer:

The time required to accumulate a charge of 1 C can then be estimated to be

1C ÷ (1.6×10-10C/s) = 6.25×109s

6.25 × 109 ÷ (365×24×3600) years

= 198 years.

Thus to collect a charge of one coulomb, from a body from which 109 electrons move out every second, we will need approximately 200 years.

Explanation:

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