magnetic field? zero 0.58m.N 0.41m.N 0.47 m N 0.52 m N A long straight wire carr

Question

magnetic field? zero 0.58m.N 0.41m.N 0.47 m N 0.52 m N A long straight wire carrying a 4-A current is placed along the x-axis as shown in Figure 22-9. What is the magnitude of the magnetic field at a point P, located at y = 0.02 m, due to the current in this wire? 20 mu T 60 mu T 40 mu T 50 mu T 30 mu T Two long parallel wires carry currents of 20 A and 5.0 A in opposite directions. The wires are separated by 0.20 m. At what point between the two wires are the contributions from the two wires the same? 0.080 m from the 20 A wire 0.18 m from the 20 A wire 0.040 m from the 20 A wire

Explanation / Answer

7. applu B = u0i/2piR

B = 4pi*10^-7 * 4/(2pi*0.02)

B = 40 uT

option C

8. B1= B2

let this distcne be x from 20A

u0i1/2pix = u0i2/2pi(0.2-x)

0.2-x/x = 5/20

0.2-x = 0.25x

1.25x = 0.2

x = 0.2/1.25 = 0.16m

so answer is 0.16m from 20 A wire

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