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)`.A. 1B. 3C. 2D. 4

Two parallel, long wires carry currents `t_(1) "and" t_(2)` with `t_(1

1.	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)`.A. 1B. 3C. 2D. 4
Answer» Correct Answer - c `(mu_(0))/(4pi) (2l_(1))/r-(mu_(0))/(4pi) (2l_(2))/r=10 muT` `(mu_(0)2l_(1))/(4pir) +(mu_(0))/(4pi) (2l_(2))/r=30 muT` On solving, `l_(1)=20 A ` and `l_(2)=10 A` So, `l_(1)//l_(2)=2`

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