Quelpr
1 markElectric Fields

CAPE Physics Unit 2 · 2005 · Paper 1 · Question 2(a)(i)b)

A point charge Q is located at A, and B is a point at distance r from Q.

Write an expression for the electric potential at B.

This question uses a figure or table from the paper — you'll see it when you practise.

The mark scheme is shown once you've answered.

Practise this question

Other parts of this question

  1. 2(a)(i)a)Write an expression for the electric field at B.[1 mark]
  2. 2(a)(ii)Show how the electric field and electric potential at B are related.[1 mark]
  3. 2(b)(i)Explain why the uncharged sphere is attracted to the positive plate.[1 mark]
  4. 2(b)(ii)Explain why the sphere subsequently oscillates between the plates.[3 marks]
  5. 2(b)(iii)When the ball is not touching either plate, the force on the ball is 0.05 N. The plates are 10 cm apart and the supply voltage is set to 1 kV. Calculate the…[3 marks]

More practice: the rest of this paper · more Electric Fields questions · all CAPE Physics Unit 2 past papers