일반물리학 2 — Magnetic Fields Due to Currents: Problem 21

21 In Fig. 29-36, a long straight wire carries a current \(i_1 = 30.0\) A and a rectangular loop carries current \(i_2 = 20.0\) A. Take the dimensions to be \(a = 1.00\) cm, \(b = 8.00\) cm, and \(L = 30.0\) cm. In unit-vector notation, what is the net force on the loop due to \(i_1\)?