Quelpr
1 markCapacitors

CAPE Physics Unit 2 · 2002 · Paper 1 · Question 2(d)(iv)

A 3 μF capacitor is charged to a p.d. of 200 V, and a 1 μF capacitor is charged to a p.d. of 100 V. The capacitors are joined by wires of negligible resistance with plates of like charge connected together.

Calculate the total energy stored in the capacitors when they are connected together.

The mark scheme is shown once you've answered.

Practise this question

Other parts of this question

  1. 2(a)Define the 'Farad'.[1 mark]
  2. 2(b)(i)Write down a formula for the equivalent capacitance of three capacitors connected in parallel.[1 mark]
  3. 2(b)(ii)Write down a formula for the equivalent capacitance of three capacitors connected in series.[1 mark]
  4. 2(c)Show that the energy stored, W, in a parallel plate capacitor of capacitance C with a voltage V across its plates is given by W = 1/2 C V^2.[2 marks]
  5. 2(d)(i)Calculate the initial charge on the 3 μF capacitor.[1 mark]
  6. 2(d)(ii)Calculate the initial charge on the 1 μF capacitor.[1 mark]
  7. 2(d)(iii)Calculate the final p.d. across the 3 μF capacitor.[2 marks]

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