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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 = x j. Calculate () the curl of A: and [5] () the curl of B: [5] 1.3 In which direction are the curls pointing? Hence what can you say about their divergence and why? [5]