allerySI unit of electric charge is the coulomb (C). 1 C is approximately:
A6.25 × 10¹⁸ electron charges
B6.25 × 10⁹ electron charges
C1.6 × 10⁻¹⁹ electron charges
D1 electron charge
Answer & Solution
Correct answer: A. 6.25 × 10¹⁸ electron charges
1. Electron charge e ≈ 1.6 × 10⁻¹⁹ C.
2. So 1 C / e = 1 / 1.6 × 10⁻¹⁹ ≈ 6.25 × 10¹⁸ electron charges.
3. Charge is quantised: Q = n e for integer n.
_Source: syllabus Physics Ch 1 §1.4 Quantisation of Charge_
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