An α-particle moves in a straight line through a vacuum with a constant speed of 4.1 × 10⁶ms⁻¹.
The α-particle enters a uniform electric field at point A, as shown in Fig. 4.1.
[Figure 4.1]
The α-particle continues to move in the same straight line until it is brought to rest at point B by the electric field. The deceleration of the α-particle by the electric field is 2.7 × 10¹⁴ ms⁻².

Q: What topic does this question test?

This question tests Electric fields in A-Level Physics (syllabus code 9702). It is worth 15 marks.

Q: Which exam paper is this question from?

This question appeared in the Cambridge A-Level Physics Oct/Nov 2021 examination, Paper 2 Variant 3 (9702_w21_qp_23.pdf).

Question

An α-particle moves in a straight line through a vacuum with a constant speed of 4.1 × 10⁶ms⁻¹.
The α-particle enters a uniform electric field at point A, as shown in Fig. 4.1.
[Figure 4.1]
The α-particle continues to move in the same straight line until it is brought to rest at point B by the electric field. The deceleration of the α-particle by the electric field is 2.7 × 10¹⁴ ms⁻².

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