일반물리학 2 — Magnetic Fields Due to Currents: Problem 34

34 In Fig. 29-45, two long straight wires at separation \( d = 30.0 \text{ cm} \) carry currents \( i_1 = 3.61 \text{ mA} \) and \( i_2 = 4.00 i_1 \) out of the page. (a) Where on the \( x \) axis is the net magnetic field equal to zero? (b) If the two currents are doubled, is the zero-field point shifted toward wire 1, shifted toward wire 2, or unchanged?