Two parallel long wires carry currents i 1 and i 2 with 
: When the currents are in the same direction, then the magnetic field midway between the wires is 
. When the direction of i 2 is reversed, then it becomes 
. Then, ratio of 
is
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
B
When the currents in the wires are in same direction. Magnetic field at mid-point O due to I and II wires are respectively
So, the net magnetic field at O,
… (i)
When the direction of 
is reversed,
and 
So, net magnetic field at O,
… (ii)
On dividing Eq. (ii) by Eq. (i), we get
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