A-LevelPhysicsElectric fields9702/12 · Oct/Nov 2020 · Q311 Mark
A molecule behaves as an electric 'dipole' consisting of two equal point charges of opposite sign, separated by a fixed distance. The molecule moves with constant horizontal velocity as it enters a vertical uniform electric field, as shown. [Figure 31.1] The positive and negative charges of the molecule enter the field at the same time. What describes the effect of the electric field on the velocity of the molecule?
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Ahorizontal component of velocity: constant, vertical component of velocity: increases
Bhorizontal component of velocity: constant, vertical component of velocity: zero
Chorizontal component of velocity: increases, vertical component of velocity: increases
Dhorizontal component of velocity: increases, vertical component of velocity: zero
✓ Correct answer
B: horizontal component of velocity: constant, vertical component of velocity: zero
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