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Q.

Two long parallel conductors carry 100 A current. If the conductors are separated by 20 mm, the force per metre of length of each conductor will be

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a

0.1 N

b

10 N 

c

100 N 

d

1 N 

answer is D.

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Detailed Solution

FL=μ0I1I22πd

the force acting per unit length of the conductor

here I1=I2=100 A, d=20 x 10-3 m; μ02π=2x10-7

we get, F/L=0.1 N/m

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