Point A in (Figure 1) is 4.0 mm from the wire. Assume that the wire is...

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Point A in (Figure 1) is 4.0 mm from the wire. Assume that the wire is very long and that all other wires are too far away to

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Answer 1

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Answer #1

net resistance of circuit

R = (20+30)* 100 / ( 20 + 30 + 100)

R = 33.33 ohm

current through circuit

i = V/R = 60/33.33 = 1.8 A

current through the wire

i' = i * 100 / ( 100 + 50) = 1.2 A

field at A

B = (uo/ 4pi) 2 i' / r

B = 10^-7* 2* 1.2 / 0.004

B = 6* 10^-5 T

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