# ElectroMechanics

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 $$2 \times 10^{11} N/m^{2}$$