CAPE Physics Unit 2 · 2007 · Paper 2 · Question 6(a)(ii)

Figure 4 shows the internal charge distribution in an unbiased p-n junction with zero applied voltage and zero net current.

Draw a diagram showing the p-n junction under forward bias, indicate the direction of current I_D, and comment on the thickness of the depletion region.

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