Physics (AS & A Level) · May / June 2016 · Paper 12 · Question 30

Before a thunderstorm, the hairs on your head sometimes stand on end. A hair with mass 0.50 mg and charge 1.0 pC 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?

1. A4.9 × 10³ N C⁻¹
2. B4.9 × 10⁵ N C⁻¹
3. C4.9 × 10⁶ N C⁻¹
4. D4.9 × 10⁹ N C⁻¹

As printed in the paper