Question

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Two long, parallel wires, 2.00 m apart, carry 20.0 A and 80.0 A currents in the same direction. At what distance from the 20.0 A current, and along the line joining the wires, is the net magnetic field of the two wires zero? (A) 0.100 (B) 0.200 (C) 0.300 (D) 0.400 (E) 0.500 (F) 0.600

Answer 1

Note- use right hand grip rule for the Direction of the Magnetic field due to current carrying wire.

As you Know the magnetic field due to current carrying wire B Hol 2718 out of the page into the page B2 Here 82=2-8, 82 B, 1,-20A I₂ = 80 A According to the to the question B₂-B₂ = 0 B₂ = B => Iz I Holz an8 Hol, 2118 2-8 8, => Iz 8, = 1 (2-8,) Here IL - 801, I, -20.A 208, = 2012-8) 40 = 2-8 =) 48, +8 = 2 58 = 2. = 2 0.4 8 = 0.4m Answer is (D).