A wire carrying current `I` and other carrying `2I` in the sam direction produce a magnetic field `B` at the midpoint. What will be the field when `2I` wire is swiched off?

Two parallel wires carrying current I and 2I in same direction have magnetic field B at the midpoint between them. If the current 2I is switched off, the magnetic field at that point will be

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 i_(1) and i_(2) with i_(1) gt i_(2) .When the current are in the same direction, the magnetic field at a point midway between the wire is 20muT .If the direction of i_(1) ,is reversed.the field becomes 30muT .The ratio i_(1)//i_(2) is

Two parallel, long wires carry current i_(1) and i_(2) with i_(1)gti_(2) . When the currents are in the same direction, the magnetic field at a point midway between the wires is 30 muT . If the direction of i_(1) is reversed , the field becomes 90muT . The ratio i_(1)//i_(2) is

Two parallel, long wires carry current i_(1) and i_(2) with i_(1)gti_(2) . When the currents are in the same direction, the magnetic field at a point midway between the wires is 30 muT . If the direction of i_(1) is reversed , the field becomes 90muT . The ratio i_(1)//i_(2) is

Two parallel wires carrying current I and 2I have magnetic field B at the mid point between them. If the current 2I is switched off, the magnetic field at that point will be :

Two long parallel wires carry equal current I flowing in the same direction are at a distance 2d apart. The magnetic field B at a point lying on the perpendicular line joining the wires and at a distance x from the midpoint is