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Two coplanar concentric circular wires m...

Two coplanar concentric circular wires made of same material have radius `R_(1)` and `R_(2) (= 2R_(1))`. The wires carry current due to identical source of emf having no internal resistance. Find the ratio of radii of cross section of the two wires if the magnetic induction field at the centre of the circle is zero.

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The correct Answer is:
`r_(1)/r_(2)=1/2`
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