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CAIE A-Level Physics A2 18.2 Uniform Electric Fields Questions

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

Question 1

[Maximum number: 2]

Fig. 4.1 shows a pair of parallel metal plates with a potential difference (p.d.) of 2400 V between them.

Fig. 4.1

Fig. 4.1

The plates are separated by a distance of 4.6 cm . The plates are in a vacuum.

Calculate the strength of the electric field between the plates.
electric field strength = NC−1\mathrm{NC}^{-1}

Question 2

[Maximum number: 7]

Question (a)

(a)

Fig. 4.1 shows a pair of parallel metal plates with a potential difference (p.d.) of 2400 V between them.

Fig. 4.1

Fig. 4.1

The plates are separated by a distance of 4.6 cm . The plates are in a vacuum.

[ 2 ]

Question (i)

(i)

Calculate the strength of the electric field between the plates.
electric field strength = NC−1\mathrm{NC}^{-1}

[ 2 ]

Question (b)

(b)

A moving proton enters the region between the plates from the left, as shown in Fig. 4.2.

Fig. 4.2

Fig. 4.2

[ 5 ]

Question (i)

(i)

The proton is deflected by the electric field.

On Fig. 4.2, draw a line to show the path of the proton as it moves through and out of the region of the electric field.

[ 2 ]

Question (ii)

(ii)

A helium nucleus (24He)\left({ }_{2}^{4} \mathrm{He}\right) now enters the region of the electric field along the same initial path as the proton and travelling at the same initial speed.

State and explain how the final speed of the helium nucleus compares with the final speed of the proton after leaving the region of the electric field.

[ 3 ]
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