Two parallel, long wires carry currents `t_(1) "and" t_(2)` with `t_(1)gtt_(2)`. When the currents are in the same direction, the magnetic field at a point midway between the wires is 10 `mu`T. If the direction of `i_(2)` is reversed, the field becomes 30 `mu`T. Find the ratio `i_(1)i_(2)`.

Answer

2