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CAIE A-Level Physics A2 18.2.2 The Effect of a Uniform Electric Field on the Motion of Charged Particles Questions

Explain force and acceleration in uniform fields, determine charge-direction motion, and relate path or speed to charge, mass and field.

Syllabus
2028–2030
Course
Physics 9702
Level
A2

Exam points

  • explain the force and acceleration of a charged particle in a uniform electric field
  • determine the direction and qualitative motion of positive or negative charges in the field
  • relate electric force, acceleration, speed or path to the charge, mass and uniform field

CAIE A-Level Physics A2 18.2.2 The Effect of a Uniform Electric Field on the Motion of Charged Particles Questions question 1

[Maximum number: 5]

Question (a)

(a)

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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