Three coplanar parallel wires, each carrying a current of 10 A along the same direction, are placed with a separation 5.0 cm between the consecutive ones. Find the magnitude of the magnetic force per unit length acting on the wires.
-
Given: - Current flowing in each wire is i1=i2=i3=10A
The magnetic force acting per unit length on wire due to the flow of the current is
So, for wire w1,
= 
by wire w2 + 
by wire w3
= 
+ 
= 6.4 x 10-4 N
And for wire w2
= 
by wire w1 - 
by wire w3
= 
- 
= 0
Similarly for wire w3
= 
by wire w1 + 
by wire w2
= 
+ 
= 6.4 x 10-4 N
1