Magnetic field due to currentHard
Question
The magnetic force between wires as shown in figure is : -
Options
A.
B.
C. 
D.None of these
Solution
magnetic field at dr, B = 
Force in small element at a distance r of wire of length L is dF = 0(dr)
F =
Force in small element at a distance r of wire of length L is dF = 0(dr)
F =
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