Physics
NULL
Medium
Question
A million electron are added to a pith ball. Its charge is________?
A
−1.6 × 10⁻¹² coulomb
B
−1.6 × 10⁻¹³ coulomb
✓ Official correct answer
C
−1.6 × 10⁻¹⁸ coulomb
D
−1.6 × 10 coulomb
Community credibility
Registered members can vote for the answer they believe is correct today and explain why. If the facts change after an election or news event, suggest a new option so others can vote it up.
A
−1.6 × 10⁻¹² coulomb
No member explanations yet for this option.
B
−1.6 × 10⁻¹³ coulomb
No member explanations yet for this option.
C
−1.6 × 10⁻¹⁸ coulomb
No member explanations yet for this option.
D
−1.6 × 10 coulomb
No member explanations yet for this option.
Explanation
Charge of one electron ≈ 1.6 × 10⁻¹⁹ C. For a million (10⁶) electrons: 10⁶ × 1.6 × 10⁻¹⁹ = 1.6 × 10⁻¹³ C (negative, since electrons carry negative charge).
So the correct answer is −1.6 × 10⁻¹³ coulomb.
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