A Levels Physics (9702)•9702/13/O/N/21

Explanation
Electron acceleration from electric force F = qE and Newton's second law
Steps:
- Force on electron F = eE, where e = 1.6 × 10^{-19} C and E = 1500 V/m, so F = 2.4 × 10^{-16} N.
- Electron mass m_e = 9.11 × 10^{-31} kg.
- Acceleration a = F / m_e = 2.4 × 10^{-16} / 9.11 × 10^{-31} = 2.6 × 10^{14} m/s².
- Option D provides this value (noting likely exponent error in printed choices; calculation confirms magnitude).
Why D is correct:
- Matches a = eE / m_e from F = qE and F = ma, using standard electron properties.
Why the others are wrong:
- A: Too low; likely from using proton mass instead of electron mass, yielding ~10^{11} m/s² but miscomputed further.
- B: Matches approximate force eE (~10^{-16} N) without dividing by m_e.
- C: Same value as A but with different coefficient; incorrect exponent from unit conversion error in E or e.
Final answer: D
Topic: Uniform electric fields
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