Question

Two long straight parallel wires, separated by d₁ = 0.775 cm, are perpendicular to the plane of the page as shown in Fig. 30-40. Wire 1 carries a current of 5.70 A into the page. What must be the current (magnitude and direction) in wire 2 for the resultant magnetic field at point P to be zero? Point P is d₂ = 1.85 cm from wire 2.

HRW7 TP 29-9Two long straight parallel wires, separated by dy = 0.775 cm, are perpendicular to the plane of the page as shown in Fig. 30-40. Wire 1 carries a current of 5.70 A into the page. What must be the current (magnitude and direction) in wire 2 for the resultant magnetic field at point P to be zero? Point P is d2 = 1.85 cm from wire 2. 1 1 Р Х ? d d, Fig. 30-40 Magnitude A Direction O out of the page into the page O can't tell either way, it doesn't matter O none of these options are correct

Answer 1

I, -5.70 A R2 di Û da P Bi for zero magnetic Aseld at point p direction of current I should be - out of the page Bi + B2 I Bil IB21 lo I Mo Iz 22 (dz) 27 (detdel - Ig = 5.70 X 1.85 Ij = I, X da (di + d2] (1.85+0.775) I2 = 4,02 I2 = 4.02 Amp