1.1 Give a physical interpretation of what is meant by the curl of a vector. [5] 1.2 Suppose a vector function A is given by A = -y i + x j and another vector function B is given by B = xj. Calculate (i) the curl of A: and (ii) the curl of B: [5] [5] 1.3 In which direction are the curls pointing? Hence what can you say about their divergence and why? [5]