A-LevelPhysicsElectric fields9702/12 · May/June 2016 · Q301 Mark
Before a thunderstorm, the hairs on your head sometimes stand on end. A hair with mass 0.50mg and charge 1.0pC is supported by a force due to an electric field. Ignore any forces other than the weight of the hair and the electric force. What is the electric field strength?
A4.9 × 10³ NC⁻¹
B4.9 × 10⁵ NC⁻¹
C4.9 × 10⁶ NC⁻¹
D4.9 × 10⁹ NC⁻¹
✓ Correct answer
C: 4.9 × 10⁶ NC⁻¹
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