Two parallel, long wires carry currents i 1 and i 2 with i 1 > i 2 . When the current are in the same direction, the magnetic field at a point midway between the wire is 10 µT. If the direction of i 2 is reversed, the field becomes 30 µT. The ratio i 1 /i 2 is
Text Solution
Verified by ExpertsThe correct answer is:
C
i 1 > i 2
(i 1 – i 2 ) = 10
(i 1 + i 2 ) = 30
= 
= 
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