a. In FIGURE P29.76, a long, straight, current-carrying wire of linear mass density μ is suspended by threads. A magnetic field perpendicular to the wire exerts a horizontal force that deflects the wire to an equilibrium angle θ. Find an expression for the strength and direction of the magnetic field B.
b. What B deflects a 55 g/m wire to a 12° angle when the current is 10 A?

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FIGURE P29.76