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Question

Two parallel wires on of length 1 m and other is infinitive, are lying at a distance of 2m. If the current flowing in each wire is 1 ampere then the force between them will be-

A
2×107 N
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B
107 N
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C
0.5 N
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D
107 N
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Solution

The correct option is B 107 N
The force between the two parallel wires one of length 1m and other in infinite,
F=μ0I1I2l2πd. . . . . .(1)
Given,
I1=I2=1A
d=2m
l=1m
μ0=4π×107
Put all value in equation (1), we get
F=4π×107×1×1×12π×2
F=107N
The correct option is B.

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