Question

two long straight parallel wires A and B separated by a distance d, carry
equal current I flowing in same direction as shown in the figure.

Find the magnetic field at a point P situated between them at a
distance x from one wire.
Show graphically the variation of the magnetic field with distance
x for 0 <x<d.
​

Answer 1

Answer:

Explanation:

B=uo i/2pi(1/x+1/(d-x))

Answer 2

You can easily determine the direction of magnetic field by each conductor using Fleming's left hand rule.

For the Wire A the field is upwards whereas for Wire B the field is downwards.

Hence Bnet = Ba - Bb

And individual field can be calculated by using Ampere Circuital Law.

Hence, Bnet = uo i/2pi(1/x-1/(d-x))

Hope it helps.

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