1. Two long parallel wires each carry a current of 50 amperes. These currents ar

Question

1. Two long parallel wires each carry a current of 50 amperes. These currents are oppositely directed. The two wires are separated by 1.00 cm. What is the magnitude of the B field half-way between the wires?
{a} 0 T {b} 2x10-3 T {c} 4x10-3 T {d} 6x10-3 T

2. Two long parallel wires each carry a current of 50 amperes. These currents are in the same direction. The two wires are separated by 1.00 cm. What is the magnitude of the B field half-way between the wires? {a} 0 T {b} 2x10-3 T {c} 4x10-3 T {d} 6xl0-3 T

3. A wire carries a current perpendicular to the page out of the plane. The direction of the B field at point A is (a) perpendicular to the page into the page (b) in the plane of the page directed from A toward the wire current (c) in the plane of the page directed away from the current (d) in the plane of the page directed straight up from A.

Explanation / Answer

1. Since the magnetic field produced by two conductors carrying currents in opposite directions are in same direction in the area between the conductors according to the right hand rule, add the magnitudes to get the resultant.

Net Magnetic Induction at the point due to both the wires = 2K{I1/r1+ I2/r2} =2* /4 * 2*50/0.01 = 2 x 10^-3 T

2. Net Magnetic Induction at the point due to both the wires = 2K{I1/r1 - I2/r2} = 0 T, as ( I1 = I2 and r1 = r2 )
where K = o/4 Wb/A-m = 10^(- 7) Wb/A-m

3. (c) in the plane of the page directed away from the current

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