How many lectrons are needed to form a charge of -2 nC?

Answer 1

To determine the number of electrons needed to form a charge of -2 nC (nanocoulombs), we first convert nanocoulombs to coulombs: -2 nC is equal to -2 x 10^-9 C. Since the charge of a single electron is approximately -1.6 x 10^-19 C, we can find the number of electrons by dividing the total charge by the charge of one electron:

[ \text{Number of electrons} = \frac{-2 \times 10^{-9}}{-1.6 \times 10^{-19}} \approx 1.25 \times 10^{10}. ]

Thus, approximately 12.5 billion electrons are needed to form a charge of -2 nC.