Two long, straight wires are oriented perpendicular to the computer screen, as s

Question

Two long, straight wires are oriented perpendicular to the computer screen, as shown in Figure 22-43, in which L = 4.5 cm. The current in one wire is I1 = 2.9 A, pointing into the screen, and the current in the other wire is I2 = 4.0 A, pointing out of the screen.

(a)Find the magnitude and direction of the net magnetic field at point P.
__________________ T
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Two long, straight wires are oriented perpendicular to the computer screen, as shown in Figure 22-43, in which L = 4.5 cm. The current in one wire is I1 = 2.9 A, pointing into the screen, and the current in the other wire is I2 = 4.0 A, pointing out of the screen. Figure 22-43 (a)Find the magnitude and direction of the net magnetic field at point P. __________________ T __________________ degree (clockwise from the dashed line to the right of P) (b) Suppose a particle with a charge of -5?MuC passes through point P with a velocity of 20000?m/s in the negative x-direction. Find the magnitude and direction of the force exerted by the magnetic field on the particle. magnitude = ______________________ N direction ... choose one answer only right out of page into page left up down

Explanation / Answer

B1 = uo*I1/2*pi*L = (2e-7*2.9)/0.045 = 1.289e-5 T

B2 = uo*I2/2*pi*L*sqrt2 = 3.22e-6

angle between B1 & B2 is 135

Bnet = sqrt(B1^2+B2^2 + 2*B1*B2*cos145)

Bnet = 1.085e-5 T

direction = tan^-1(B2*sin135/(B1+ B2*cos135)

doirection = 67.5

b) Fb = q*V*Bnet

F = 5e-6*20000*1.085e-5

F = 1.085e-6 N

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