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In Fig.29-64, five long parallel wires in an xy plane are separated by distance d=50.0cm. The currents into the page are i1=2.00A,i3=0.250A,i4=4.00A,andi5=2.00A; the current out of the page is i2=4.00A. What is the magnitude of the net force per unit length acting on wire 3 due to the currents in the other wires?

Short Answer

Expert verified

The magnitude of the net force per unit length acting on wire 3 due to current in the other wires isFL=8.00×10-7N/m

Step by step solution

01

Given

  • Five long parallel wires are separated by distanced=50.0cm
  • The current in wire 1 isi1=2.00A.
  • The current in wire 2 isi2=4.00A.
  • The current in wire 3 isi3=0.250A
  • The current in wire 4 isi4=4.00A
  • The current in wire 5 isi5=2.00A
  • The current into the page arei1, i3,i4, andi5.
  • The current out of the page is i2.
02

Understanding the concept

Using Eq. 29-13 and considering the given summary, we can find the magnitude of net force per unit length acting on wire 3 due to current in the other wires.

Formula:

From Eq. 29-13, the force between two parallel currents is

Fx=μ0Li1i22πd

03

Calculate the magnitude of the net force per unit length acting on wire 3 due to current in the other wires.

From Eq. 29-13, the force between two parallel currents is

Fx=μ0Li1i22πd

Since currents into the page arei1, i3,i4, andi5, wire 3 is, therefore, attached to all but wire 2.

Therefore, from Eq. 29-13, themagnitude of net force per unit length acting on wire 3 due to the current in the other wires is

FL=μ0i32π-i12d+i2d+i4d+i52d

Substituting given values, we get

FL=4π×10-70.2502π-2.0020.500+4.000.500+4.000.500+2.0020.500FL=4π×10-70.2502π16FL=8.00×10-7N/m

Hence, the magnitude of the net force per unit length acting on wire 3 due to current in the other wires is FL=8.00×10-7N/m

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Most popular questions from this chapter

Figure 29-49 shows two very long straight wires (in cross section) that each carry a current of4.00A directly out of the page. Distance d1=6.00m and distance d2=4.00m. What is the magnitude of the net magnetic field at point P, which lies on a perpendicular bisector to the wires?

In Fig. 29-54a, wire 1 consists of a circular arc and two radial lengths; it carries currenti1=0.50Ain the direction indicated. Wire 2, shown in cross section, is long, straight, and Perpendicular to the plane of the figure. Its distance from the center of the arc is equal to the radius Rof the arc, and it carries a current i2 that can be varied. The two currents set up a net magnetic fieldBat the center of the arc. Figure bgives the square of the field’s magnitude B2 plotted versus the square ofthe currenti22. The vertical scale is set byBs2=10.0×10-10T2what angle is subtended by the arc?

In Fig. 29-43, two long straight wires at separation d=16.0cmcarry currents i1=3.61mAand i2=3.00i1out 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?

Figure 29-89 is an idealized schematic drawing of a rail gun. Projectile Psits between two wide rails of circular cross section; a source of current sends current through the rails and through the(conducting) projectile (a fuse is not used). (a) Let wbe the distance between the rails, Rthe radius of each rail, and i the current. Show that the force on the projectile is directed to the right along the rails and is given approximately byF=i2μ02π·ln(w+RR)

(b) If the projectile starts from the left end of the rails at rest, find the speed vat which it is expelled at the right. Assume that I = 450 kA, w = 12 mm, R = 6.7 cm, L = 4.0 m, and the projectile mass is 10 g.

In Figure 29-46 two concentric circular loops of wire carrying current in the same direction lie in the same plane. Loop 1 has radius1.50cm and carries 4.00mA. Loop 2 has radius2.50cmand carries 6.00mA.Loop 2 is to be rotated about a diameter while the net magnetic field Bset up by the two loops at their common center is measured. Through what angle must loop 2 be rotated so that the magnitude of that net field is 100nT?

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