4. A wire is bent into the shape shown in Figure 4. If a = 20 cm and I= 12 A, calculate the magnetic field at point P. Ans.: 8.26 x 10-5 T, out of page a IN a/2 a/4 P. Figure 4.
4. A wire is bent into the shape shown in Figure 4. If a = 20 cm and I= 12 A, calculate the magnetic field at point P. Ans.: 8.26 x 10-5 T, out of page a IN a/2 a/4 P. Figure 4.
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Transcribed Image Text:4.
A wire is bent into the shape shown in Figure 4. If a = 20 cm and
I = 12 A, calculate the magnetic field at point P.
Ans.: 8.26 x 10-5 T, out of page
CO
a/2
a
a/4
P.
Figure 4.
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Step 1: Know the formula for the magnetic field due to wire:
VIEWStep 2: Draw a figure of the horizontal wire and modify the equation (1).
VIEWStep 3: Calculate the distance AP, BP, DP and CP.
VIEWStep 4: Calculate the magnetic field at point P due to wire AB.
VIEWStep 5: Calculate the magnetic field at point P due to wire BC.
VIEWStep 6: Calculate the magnetic field at point P due to wire CD.
VIEWStep 7: Calculate the magnetic field at point P due to wire DA.
VIEWStep 8: Find the net magnetic field at point P.
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