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Figure 29-45 shows two current segments. The lower segment carries a current of i1=0.40Aand includes a semicircular arc with radius 5.0cm, angle 180°, and center point P. The upper segment carries current i2=2i1and includes a circular arc with radius 4.0cm, angle 120°, and the same center point P. What are the(a) magnitude and (b) direction of the net magnetic field at Pfor the indicated current directions? What are the (c)magnitude of if i1 is reversed and (d) direction B of if i1 is reversed?

Short Answer

Expert verified
  1. The magnitude of the net magnetic fieldB at Pfor the indicated current directions is 1.7×10-6T.
  2. The direction of the net magnetic fieldB at Pfor the indicated current directions is-k^.
  3. The magnitude of the magnetic field Bifi1 is reversed is 6.7×10-6T.
  4. The direction of the magnetic fieldB ifi1 is reversed is -k^.

Step by step solution

01

Given

  1. Current in the lower segmenti1=0.40A
  2. Radius of the lower segmentr1=5.0cm=0.05m
  3. Angle of the lower arcθ1=1800=πrad
  4. Current in the upper segmenti2=2i1
  5. Radius of the lower segmentr1=4.0cm=0.04m
  6. Angle of the lower arcθ2=1200=2π3rad
02

Determine the formulas

Write the formula for the magnetic field:

B=μ0iθ4πR

03

(a) Calculate the magnitude of the net magnetic field B→ at P for the indicated current directions

The magnitude of the magnetic field is given by

B=μ0i1θ14πr1k^-μ0i2θ24πr2

Substitute the values and solve as:

B=μ00.40Aπrad4π0.05mk^-μ00.80A2π3rad4π0.04mk^B=μ04π8π-403πk^B=μ04π-5.33πk^B=-1.7×10-6k^

Therefore, the magnitude of the net magnetic fieldB at P for the indicated current directions is 1.7×10-6T.

04

(b) Calculate the direction of the net magnetic field B→ at P for the indicated current directions

The result of part a shows that the direction of the magnitude of the net magnetic fieldB at P for the indicated current directions is into the page, therefore, the direction is -k^

05

(c) Calculate The magnitude of the magnetic field B→ if i1 is reversed

For the reverse direction of the currenti1,the magnitude of the magnetic field is given by

B=-μ0i1θ14πr1k^-μ0i2θ24πr2

Substitute the values and solve as:

B=-μ00.40A2πrad4π0.05mk^-μ00.80A2π3rad4π0.04mk^B=-μ04π8π-403πk^B=μ04π-21.33πk^B=-6.7×10-6k^

Therefore, the magnitude of the magnetic fieldB ifi1 is reversed is 6.7×10-6T.

06

(d) Calculate the direction of the magnetic field B→ if i1 is reversed

The result of part c shows that the direction of the magnitude of the net magnetic fieldB at P for the indicated current directions is into the page, therefore, the direction is -k^.

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Most popular questions from this chapter

Figure 29-50ashows, in cross section, two long, parallel wires carrying current and separated by distance L. The ratio i1/i2 of their currents is4.00; the directions of the currents are not indicated. Figure 29-50bshows the ycomponent Byof their net magnetic field along the xaxis to the right of wire 2. The vertical scale is set by Bys=4.0nT , and the horizontal scale is set by xs=20.0cm . (a) At what value of x0 is Bymaximum?(b) If i2=3mA, what is the value of that maximum? What is the direction (into or out of the page) of (c) i1 and (d) i2?

A wire with currenti=3.00Ais shown in Figure. Two semi-infinite straight sections, both tangent to the same circle, are connected by a circular arc that has a central angle θand runs along the circumference of the circle. The arc and the two straight sections all lie in the same plane. If B=0at the circle’s center, what is θ?

Figure 29-29 gives, as a function of radial distance r, the magnitude Bof the magnetic field inside and outside four wires (a, b, c, and d), each of which carries a current that is uniformly distributed across the wire’s cross section. Overlapping portions of the plots (drawn slightly separated) are indicated by double labels. Rank the wires according to (a) radius, (b) the magnitude of the magnetic field on the surface, and (c) the value of the current, greatest first. (d) Is the magnitude of the current density in wire agreater than, less than, or equal to that in wire c?

Figure 29-27 shows cross-sections of two long straight wires; the left-hand wire carries current i1 directly out of the page. If the net magnetic field due to the two currents is to be zero at point P, (a) should the direction of current i2 in the right-hand wire be directly into or out of the page, and (b) should i2 be greater than, less than, or equal to i1?

In Fig. 29-44, point P2is at perpendicular distanceR=25.1cm from one end of a straight wire of length L=13.6cmcarrying current i=0.693A.(Note that the wire is notlong.) What is the magnitude of the magnetic field at P2?

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