To determine how many electrons are needed to form a charge of $-2.00$ nC, we use the charge of a single electron.

Given:

• Charge to be formed: $Q = -2.00$ nC
• Charge of one electron: $e = -1.602 \times 10^{-19}$ C

Calculation:

The number of electrons $n$ required is given by:

$n = \frac{Q}{e}$

Substituting the values:

$n = \frac{-2.00 \times 10^{-9} \text{ C}}{-1.602 \times 10^{-19} \text{ C/electron}}$

$n \approx 1.25 \times 10^{10} \text{ electrons}$

Thus, $1.25 \times 10^{10}$ electrons are needed to form a charge of $-2.00$ nC.

Would you like a breakdown of the calculation or further details?

Related Questions:

1. What is the total charge of $5 \times 10^9$ electrons?
2. How many protons are needed to form a charge of $+3.00$ nC?
3. What is the significance of the elementary charge in physics?
4. How does electron transfer create static electricity?
5. What is the relationship between charge and electric current?

Tip:

Remember that the charge of a single electron is always negative, so when calculating charge, consider both magnitude and sign.