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Physics · Chapter 10: Electric fields and forces

Year 11 Science · About 16 minutes with activities · Turn your sound on

Chapter 10 · Electric fields and forces
The beam bendstowards the top plate
Pulled to the + plateelectrons are negative
Proton+1.6 × 10⁻¹⁹ C
Electron−1.6 × 10⁻¹⁹ C
Attractopposite charges
Repellike charges
Repellike charges
Away from +
Towards −
From + to −opposite charges attract
Like charges repelthe lines bend away from each other
North to southmagnetic field lines
Uniform fieldsame strength at any point between the plates
Towards − platepositive charge
Towards + platenegative charge
No forceneutral: no charge
Parallel-plate labset the voltage and the gap, then fire a particle

Chapter 10 recap

  • Charges: opposite charges attract, like charges repel. Electron −1.6 × 10⁻¹⁹ C, proton +1.6 × 10⁻¹⁹ C. Field arrows point away from + and towards −.
  • Parallel plates: a uniform field, arrows from + to −, touching both plates, parallel and equally spaced. Positive charges → negative plate; negative charges → positive plate; neutral → no force.
  • F = Eq (N = N/C × C) and E = V/d (V/m, d in metres). 1 N/C = 1 V/m. Force is a vector: state its direction.
  • Physics course complete: revise any chapter from the course home page

How can an invisible field bend a beam of electrons?

Chapter 10 · About 16 minutes · sound on

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