A piece of purple plastic is charged with 9.31×106 extra electrons compared to its neutral state. What is its net electric charge (including its sign) in coulombs?

Q = - 1.5 x 10⁻¹² Coulomb

Explanation:

While in the neutral state, the charge on the piece of purple plastic must be zero. So the net charge is due to the charge of the extra electrons. Therefore,

Q = ne

where,

Q = net charge on piece of purple plastic = ?

n = No. of extra electrons on piece of purple plastic = 9.31 x 10⁶ electrons

e = Charge on one electron = - 1.6 x 10⁻¹⁹ Coulomb

Therefore,

Q = (9.31 x 10⁶)(- 1.6 x 10⁻¹⁹ Coulomb)

Q = - 1.5 x 10⁻¹² Coulomb

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