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Unformatted text preview: . 10-13 i T. What are the speed and direction of the proton? Problem 4 A wire along the x-axis carries current I in the negative x-direction through the magnetic eld ~ B = B x l k x l elsewhere (1) (a) Draw a graph of B versus x over the interval-3 2 l < x < 3 2 l . (b) Find an expression for the net force ~ F net on the wire. (c) Find an expression for the net torque on the wire about the point x = 0. Problem 5 A nonuniform magnetic eld exerts a net force on a current loop of radius R . The gure below shows a magnetic eld that is diverging from the end of a bar magnet. The magnetic eld at the position of the current loop makes an angle with respect to the vertical. (a) Find an expression for the net magnetic force on the current. (b) Calculate the force if R = 2 . 0 cm, I = 0 . 50 A, B = 200 mT, and = 20 . Figure 3: g. for Problem 5 1 - 2...
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