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CAIE A-Level Physics 18.2 Uniform Electric Fields

Practise calculating uniform electric field strength with E = delta V/delta d and explaining charged-particle force and motion between plates.

Syllabus
2028–2030
Course
Physics 9702
Level
A2

Exam points

  • calculate uniform field strength using E=ΔV/Δd and interpret plate-field direction
  • explain charged-particle motion and force in a uniform electric field

Covered syllabus points

18.2.1—E = ∆V / ∆d to calculate the field strength of the uniform field between18.2.2—The effect of a uniform electric field on the motion of charged particles

18.2 Uniform electric fields question 1

[Maximum number: 3]

Two parallel metal plates X and Y are separated by a distance of 0.041 m , as shown in Fig. 6.1.

Fig. 6.1

Fig. 6.1

There is a vacuum between the plates. An electron is at rest at the centre of plate X.
A potential difference (p.d.) of 58 kV is applied across the plates. This causes the electron to accelerate towards plate Y.

Question (a)

(a)

On Fig. 6.1, use the symbols + and - to indicate which of plates X and Y is the positive plate and which is the negative plate.

[ 1 ]

Question (b)

(b)

Calculate the electric field strength E between the plates. Give a unit with your answer.
E= unit

[ 2 ]
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