A potential difference of 1.2 × 10³ V is applied between a pair of horizontal metal plates in a vacuum, as shown in Fig. 3.1. [Figure 3.1] The separation of the plates is 3.6cm. The electric field between the plates is uniform. A particle of mass 5.9 × 10⁻⁶kg and charge –4.2 × 10⁻⁹C enters the field at point X with a horizontal velocity of 0.75ms⁻¹ along a line midway between the two plates. The particle is deflected by the field and hits the top plate at point Y.

Q: What topic does this question test?

This question tests Electric fields in A-Level Physics (syllabus code 9702). It is worth 12 marks.

Q: Which exam paper is this question from?

This question appeared in the Cambridge A-Level Physics Oct/Nov 2019 examination, Paper 2 Variant 3 (9702_w19_qp_23.pdf).

Question

A potential difference of 1.2 × 10³ V is applied between a pair of horizontal metal plates in a vacuum, as shown in Fig. 3.1. [Figure 3.1] The separation of the plates is 3.6cm. The electric field between the plates is uniform. A particle of mass 5.9 × 10⁻⁶kg and charge –4.2 × 10⁻⁹C enters the field at point X with a horizontal velocity of 0.75ms⁻¹ along a line midway between the two plates. The particle is deflected by the field and hits the top plate at point Y.

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