Two parallel long wires carry currents 18A and 3A. When the currents are in the same direction, the magnetic field at a point midway between the wire is B_(1). If the direction of i_(2) is reversed, the field becomes B_(2). Then the value of B_(1)//B_(2) is

Two parallel long wires carry currents 18A and 3A. When the currents a

1.	Two parallel long wires carry currents 18A and 3A. When the currents are in the same direction, the magnetic field at a point midway between the wire is B_(1). If the direction of i_(2) is reversed, the field becomes B_(2). Then the value of B_(1)//B_(2) is
Answer» `5:7` `7:5` `3:5` `5:3` ANSWER :A

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Two parallel long wires carry currents 18A and 3A. When the currents are in the same direction, the magnetic field at a point midway between the wire is B_(1). If the direction of i_(2) is reversed, the field becomes B_(2). Then the value of B_(1)//B_(2) is

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