Two long straight parallel wires are separated by a distance 2a. If the wirescarry an equal currentIin opposite directions, what is the magnetic fieldin the plane of the wires at a point i) midway between them and
ii) at adistanceafrom one and 3a from the other?
a. μ0i/2 πa
b. (μ0i/2 πa)+(μ0i/4 πa)
c. (μ0i/2 πa)--(μ0i/4 πa)
d. μ0i/3 πa

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