Two thin long parallel wires separated by a distance b are carrying a current i amp each. The magnitude of the force per unit length exerted by one wire on the other is
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
B
Let two long parallel thin wires 
and 
carry current 
and separated by a distance 
apart.
The magnitude of magnetic field 
at any point on 
due to current 
in 
is given by
The magnitude of force acting on length 
of 
is
Force per unit length is
Given, 
, therefore,
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