Two long parallel wires, separated by a distance 
have equal current I flowing in each of them. The magnetic field of one exerts a force F on the other. The distance R is increased to 4 R and the current in each wire is reduced from I to 
. What is the force between them now?
A
4 F
B
64 F
C
D
Text Solution
Verified by ExpertsThe correct answer is:
D
The force per unit length is,
If 
is increased to 
and 
is reduced to 
, the force per unit length becomes,
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