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

An experiment measures the permeability of free space using two circular coils of n = 100 turns, radius R = 5.0 cm separated by a = 1 cm, suspended on a balance scale where weights are added to balance the scale as current I varies. F = (mu_0 * n^2 * I^2 * R) / a.

Complete the third column of Table 1 by calculating I^2 / (A^2 * 10^-4).

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