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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the order for strong to weak forces such as

strong nuclear force → electromegnetic force → weak nuclear force → gravitational force

the fundamental forces are those forces that act between to objects or element to make interactions. there are four types of fundamental forces such as strong and weak nuclear forces (due to protons and electrons), electromagnetic force (due to the motion of electrons) and gravitational force (due to orbital movement of the planet). if these forces are arranged on the basis of their maximum strength then the order is

strong nuclear force → electromegnetic force → weak nuclear force → gravitational force