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

Short Answer

Expert verified

The net magnetic field at point P is B=-2.0×10-4Tk.

Step by step solution

01

Step 1: Identification of the given data

The current through wire is,i=10A

The length of wire is,a=10cm

02

Understanding the concept

For this problem, we will use the equation for magnetic field due to finite wire of length L, carrying currenti, at a point P above the right end of the wire, and at distanceR from the wire. Direction of the magnetic field will depend on the direction of the current;we can determine this by right hand thumb rule.

Formula:

Magnetic field due to finite wire of length L, carrying currenti, at a point P above the right end of the wire, and at distance R from the wire is

Bp=μ0i4πR·LL2+R2

03

Calculate the net magnetic field at point P

We break the wire loop in eight parts as shown in the figure.We can find the magnetic field due to each part at point P

Due to part 1 magnetic field is B1

B1=μ0i4πa4·a4a42+a4212B1=-μ0i2aπk

Due to part 2 magnetic field is B2

B2=μ0i4π·a4·3a43a42+a4212B2=-3μ0i10aπk

Due to part 3 magnetic field is B3

B3=μ0i4π·3a4·a43a42+a4212B3=-μ0i310aπk

Due to part 4 magnetic field is B4

B4=μ0i4π·3a4·3a43a42+3a4212B4=-2μ0i6aπk

Due to part 5 magnetic field is B5

B5=μ0i4π·3a4·3a43a42+3a4212B5=-2μ0i6aπk

Due to part 6 magnetic field is B6

B6=μ0i4π·3a4·a43a42+a4212B6=-μ0i310aπk

The net magnetic field at point Pthen becomes

B=B1+B2+B3+B4+B5+B6+B7+B8

B=-kμ0iaπ·12+310+1310+26+26+1310+310+12B=-k2μ0iaπ·12+310+1310+26B=-k8μ0ia4π·12+310+1310+26

Substitute all the value in the above equation.

B=-k4π×10-7T.m/A×10A4π×10×10-2m12+310+1310+26B=-k·10-412+310+1310+26TB=-2.0×10-4Tk

Hence the net magnetic field at pointP isB=-2.0×10-4Tk

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