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What is the smallest magnitude of free electric charge observed in nature so far?

1. 1 C
2. 4.8*10⁻¹³ C
3. 1.6*10⁻¹⁹ C
4. none of the above

Correct answer: 1.6*10⁻¹⁹ C

Solution

All observed free charges are integer multiples of the elementary charge e = 1.6*10⁻¹⁹ C, the smallest free charge.

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