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Sahay Sir > Question Answers > Cengage JEE Mains Physics by B.M Sharma > Chapter 17 - Electric Charge and Field > A positively charged sphere of radius 10 cm is surrounded by medium of dielectric constant 10. If the magnitude of the electric field intensity of the point outside the sphere at a distance r from the centre of the sphere is 6.4 x 10^-4 V/m, and the the sphere is 6.4 x 10^-12 C, then r is

A positively charged sphere of radius 10 cm is surrounded by medium of dielectric constant 10. If the magnitude of the electric field intensity of the point outside the sphere at a distance r from the centre of the sphere is 6.4 x 10^-4 V/m, and the the sphere is 6.4 x 10^-12 C, then r is

An electron initially at rest falls a distance of 1.5cm in a uniform electric field of magnitude 2×10^4N/C. The time taken by the electron to fall this distance is