Question

two long wires carry currents i1 and i2 such that i1>i2. when the currents are in the same direction the magnetic field at a point midway between the wires is 9×10^-6 T. if the direction of i2 is reversed the field becomes 3×10^-5 T. the ratio i1/i2 is. Please answer fast​

Answer 1

Answer:

Explanation:

Magnetic field at perpendicular distance x from a long wire carrying current i is  

we know, current through two parallel long wires are in same direction then, magnetic field at the midpoint of parallel wires is  

Let (2d) is separation between two parallel wires.

so,  

given, B = 10

so, (1)

current through two parallel long wires are in opposite directions then, magnetic field at the midpoint of parallel wires is  

or,  

given, B' = 30

so, (2)

from equations (1) and (2),