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Question: In Fig 29-55, two long straight wires (shown in cross section) carry currentsi1=30.0mAandi1=40.0mAdirectly out of the page. They are equal distances from the origin, where they set up a magnetic field. To what value must current i1be changed in order to rotate20.0°clockwise?

Short Answer

Expert verified

The value of current i1 is i1=61.3mA.

Step by step solution

01

Given

i) Currents flowing through the two long straight wires are i1=30.0mAand i2=40.0mA

ii) The rotation of net magnetic field Bisθ=20.0°.

02

Determine the formula for the magnetic field as:

Use the concept of the magnetic force due to current in straight wires and trigonometry.

Formulae:

Bstraight=μ0i4πR

tanθ=ByBx

03

Calculate the value to which current i1 must be changed in order to rotate 20.0° clockwise

The value of current i1:

The magnetic field due to a current in straight wire is

Bstraight=μ0i4πR

The distances of the B1and B2are the same; hence they are directly proportional localid="1663143974221" i1and i2respectively.

B1αi1and

B2αi2

According to the right hand rule,is going to the y axis andis going along x axis.

The angle of the net field is

tanθ=ByBx

tanθ=B2B1

θ=tan-1i2i1

Substitute the values and solve as:

θ=tan-140.0mA30.0mA

θ=53.13°

In the problem, the net field rotation is

θ'=θ-20.0°

θ'=53.13°-20.0°

θ'=33.13°

The final value of the current is:

tanθ'=i2i1

i1=i2tanθ'

Substitute the values and solve as:

i1=40.0mAtan33.13°

i1=61.3mA

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Most popular questions from this chapter

Question: Figure 29-28 shows three circuits consisting of straight radial lengths and concentric circular arcs (either half- or quarter-circles of radii r, 2r, and 3r). The circuits carry the same current. Rank them according to the magnitude of the magnetic field produced at the center of curvature (the dot), greatest first.

In Figure, a long straight wire carries a current i1=30.0Aand a rectangular loop carries currenti2=20.0 A. Take a=1.00cm,b=8.00cm,andL=30.0cm. In unit-vector notation, what is the net force on the loop due to i1 ?

Three long wires all lie in an xyplane parallel to the xaxis. They are spaced equally,10 cm apart. The two outer wires each carry a current of 5.0 Ain the positive xdirection. What is the magnitude of the force on a3.0 m section of either of the outer wires if the current in the center wire is 3.2 A(a) in the positive xdirection and (b) in the negative xdirection?

Figure 29-79 shows a closed loop with currenti=2A. The loop consists of a half-circle of radius4m, two quarter-circles each of radius2m, and three radial straight wires. What is the magnitude of the net magnetic field at the common center of the circular sections?

A toroid having a square cross section, 5.00cmon a side, and an inner radius of15.0cmhas500turnsand carries a current of0.800A. (It is made up of a square solenoid—instead of a round one as in Figure bent into a doughnut shape.) (a) What is the magnetic field inside the toroid at the inner radius and (b) What is the magnetic field inside the toroid at the outer radius?

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