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4. A circular conducting loop of radius r carrying current I as shown in Fig. 4 is placed above the North pole of a cylindrical bar magnet. Everywhere on the loop, the magnetic field of the magnet has the same magnitude B and makes angle a with the vertical axis in a diverging fashion (as sketched). What is the total resultant force F produced on the loop by the magnet? Is it zero or not and why? If it is not zero, find F both in direction and magnitude? Figure 4: Illustration for problem 4.

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