A ring of radius 0.1 m is made out of a thin metallic wire of area of cross section \( 10^{-6} m^{2}\). The ring has a uniform charge of \(\pi\) coulombs.

Find the change in radius ( in mm ) of the ring when a charge of \(10^{-8}\) coulomb is placed at the centre of the ring.

Details & Assumptions

  • Young's modulus of the metal \(2 \times 10^{11} N/m^{2}\)

  • Answer in millimetres

Also try He is Invisible


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