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The force per unit length of two paralle...

The force per unit length of two parallel conductors separated by `r_(1)` is `5times10^(-7)Nm^(-1)` .They are moved closer then the separation is `r_(2)` and force per unit length is `8times10^(-7)Nm^(-1)` .The ratio of `r_(1):r_(2)` is .

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