Very much appreciated. I need help on these homework problems and I\'ve visited
ID: 1455975 • Letter: V
Question
Very much appreciated. I need help on these homework problems and I've visited my schools tutors but they're not confident in any of the help they give me and on some they just tried to "steer" me in the right direction and it wasn't helpful. I need this to study from to really understand this material. Very much appreciated. I need help on these homework problems and I've visited my schools tutors but they're not confident in any of the help they give me and on some they just tried to "steer" me in the right direction and it wasn't helpful. I need this to study from to really understand this material. I need help on these homework problems and I've visited my schools tutors but they're not confident in any of the help they give me and on some they just tried to "steer" me in the right direction and it wasn't helpful. I need this to study from to really understand this material. Two long parallel wires 20 cm apart carry currents of 5 A and 9 A irn the same direction. At what point between the two wires is the magnet field zero?
Explanation / Answer
Using the right-hand rule, will convince one that the magnetic field contriubtions from the two wires only cancel in the region between the wires. One must find a position that is four times closer to the upper wire, which would be one cm below the upper wire. Using algebra to come to the same conclustion, consider a point located a distance y below the upper wire.
5/y = 9/(20-y)
solving this we get
100-5y = 9y
y = 100/14 = 7.142 cm below the 5.0 amp wire.
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