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In Fig. 29-40, two semicircular arcs have radii R2=7.80cmand R1=3.15cmcarry current i=0.281A and have the same center of curvature C. What are the (a) magnitude and (b) direction (into or out of the page) of the net magnetic field at C?

Short Answer

Expert verified
  1. The value of the magnetic field is B=1.67×10-6T.
  2. The direction of the magnetic field is into the page.

Step by step solution

01

Given

  1. Radius isR2=7.80cm
  2. Radius isR1=3.15cm
  3. Current isi=0.281A
  4. Figure 29-40 is two semi-circular arcs.
02

Determine the concept

Use the concept of magnetic field at the center of circular arc. Using the equation, find the magnetic field at the given point. Using right hand rule determine the direction of the magnetic field.

Formulae:
B=μ04πR

03

(a) Calculate the magnitude of the net magnetic field at C

The magnitude of the magnetic field at point C:

The magnetic fields due to both arcs are opposite due to opposite direction of currents.

The total magnetic field will be the vector addition of both. So,

μ0iϕ4πR1-μ0iϕ4πR2

Substitute the values and solve further as:

B=μ0iϕ4π1R1-1R2

The angle isϕ=π

B=4π×10-7iπ4π1R1-1R2B=iπ×10-71R1-1R2

.

Substitute the values and solve:

role="math" localid="1663096149133" B=0.281A3.14×10-710.0315m-10.0780mB=1.67×10-6T

Hence the magnetic field is, 1.67×10-6T.

04

(b) Calculate the direction (into or out of the page) of the net magnetic field at C

Direction of the magnetic field at point C:

By using the right hand rule, we can get the direction of the magnetic field which is into the page.

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Most popular questions from this chapter

The current-carrying wire loop in Fig. 29-60a lies all in one plane and consists of a semicircle of radius 10.0cm, a smaller semicircle with the same center, and two radial lengths. The smaller semicircle is rotated out of that plane by angleθ, until it is perpendicular to the plane (Fig.29-60b). Figure 29-60c gives the magnitude of the net magnetic field at the center of curvature versus angleθ . The vertical scale is set byBa=10.0μTandBb=12.0μT. What is the radius of the smaller semicircle?

Figure 29-34 shows three arrangements of three long straight wires carrying equal currents directly into or out of the page. (a) Rank the arrangements according to the magnitude of the net force on wire Adue to the currents in the other wires, greatest first. (b) In arrangement 3, is the angle between the net force on wire A and the dashed line equal to, less than, or more than 45°?

In unit-vector notation, what is the magnetic field at pointPin Fig. 29-86 ifi=10Aanda=8.0cm? (Note that the wires are notlong.)

Figure a shows, in cross section, three current-carrying wires that are long, straight, and parallel to one another. Wires 1 and 2 are fixed in place on an xaxis, with separation d. Wire 1 has a current of0.750A, but the direction of the current is not given. Wire 3, with a current of0.250Aout of the page, can be moved along the xaxis to the right of wire 2. As wire 3 is moved, the magnitude of the net magnetic forceF2on wire 2 due to the currents in wires 1 and 3 changes. The xcomponent of that force is F2xand the value per unit length of wire 2 isF2x/L2. Figure bgivesF2x/L2versus the position xof wire 3. The plot has an asymptoteF2xL2=-0.627μN/masx.The horizontal scale is set byxs=12.0cm. (a) What are the size of the current in wire 2 and (b) What is the direction (into or out of the page) of the current in wire 2?

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?

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