A ring of radius 0.1 m is made out of a thin metallic wire of area of cross section 106m2 10^{-6} m^{2}. The ring has a uniform charge of π\pi coulombs.

Find the change in radius ( in mm ) of the ring when a charge of 10810^{-8} coulomb is placed at the centre of the ring.

Details & Assumptions

  • Young's modulus of the metal 2×1011N/m22 \times 10^{11} N/m^{2}

  • Answer in millimetres

Also try He is Invisible


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