Common static electricity involves charges ranging from nanocoulombs to microcoulombs. (a) how many electrons are needed to form a charge of –2.00nc (b) how many electrons must be removed from a neutral object to leave a net charge of 0.500µc ?

In the first case there are 1.25 × 10^10 electrons in the second case, there are 3.1  × 10^12  electrons.

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Static electricity is usually composed of electric charges of very small magnitude such as nanocoulombs to microcoulombs.

For question (a)

Q = ne

Q= magnitude of electric charge

n = number of electrons

e = magnitude of electronic charge

2 × 10^-9 C = n1.6 × 10^-19C

n = 2 × 10^-9 C/1.6 × 10^-19C

n = 1.25 × 10^10 electrons

For question (b)

0.5  × 10^-6 = n1.6 × 10^-19C

n = 0.5  × 10^-6/1.6 × 10^-19C

n = 3.1  × 10^12  electrons

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