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Answer to Question #86676 in Electricity and Magnetism for Chandan
Question #86676
Two long, straight, parallel wires 24 cm apart carry currents of I1 = 30A andI2 = 20A in the same direction. Determine the magnetic field in the plane of the twowires at a point halfway between the wires.
Expert's answer
Induction of the direct wire field B = μ0I/2πr, in accordance with the principle of superposition Bh = μ0 (I1 - I2)/πl = 4*10-7*10/ 0.24 = 16.7 (mT).
So, B = 16.7 mT.
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Metallic iron contains approximately 1029 atoms per cubic meter. The magnetic moment of each iron atom is 1.8 × 10−23 Am−1. If all the dipoles were perfectly aligned what would be the magnetisation M and the magnetic moment of a bar 10 cm long and 1cm2 in cross-section?
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