Walker, Halliday & Resnick — Magnetic Fields: Problem 10

10 The bent wire shown in Fig. 28-25 lies in a uniform magnetic field. Each straight section is 2.0 m long and makes an angle of \(\theta = 60^\circ\) with the x axis, and the wire carries a current of 3.5 A. What is the net magnetic force on the wire in unit-vector notation if the magnetic field is given by (a) \(4.0\hat{k}\) T and (b) \(4.0\hat{i}\) T?