A ring of radius 0.1 m is made of thin metallic wire of area of cross-section 10^-6m² . The ring has a uniform charge of π coulomb. Young’s modulus of metal of wire in $2\times {10}^{11}\mathrm{N}/{\mathrm{m}}^2$ . When a charge of 10^-8C  is placed at the centre of the ring, then