Question

A body has a charge of \( -3.2 \mu C \). The number of excess electrons it has is

• A. \( 1.2 \times 10^{15} \)
• B. \( 5 \times 10^{10} \)
• C. \( 3.2 \times 10^{16} \)
• D. \( 5.12 \times 10^{13} \)

Answer 1

The Correct Option is C

To find the number of excess electrons, we use the formula:
\(n = \frac{|q|}{e}\) where: 
- \(q = 3.2 \times 10^{-6} \text{C} \) is the charge on the body, 
- \(e = 1.6 \times 10^{-19} \text{C} \) is the charge of one electron. 

Substituting the values: \(n = \frac{3.2 \times 10^{-6}}{1.6 \times 10^{-19}} = 3.2 \times 10^{16}\)
Thus, the number of excess electrons is \(( 3.2 \times 10^{16} ).\)