Two long parallel wires P and Q are held perpendicular to the plane of the paper at a separation of 5 m. If P and Q carry currents of 2.5 A and 5 A respectively in the same direction, then the magnetic field at a point midway between P and Q is
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
C
When the current flows in both wires in the same direction then magnetic field at half way due to the wire P,
(where 
)
The direction of 
is downward 
Magnetic field at half way due to wire Q
[where 
.]
Net magnetic field at half way
Hence, net magnetic field at midpoint 
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