Electric Charges and Fields 1 With a charge g at the centre an imaginary Gaussian sphere is constructed with a radius r The magnitude of intensity of field at any point on the Gaussian surface is E and the flux through the Gaussian surface is d If we change the radius of the Gaussian surface to 2r what happens to the values of electric field E and electric flux on the new surface A E decreases increases C E increases remains constant 2 ABC is an equilateral triangle of side L A charge q is kept at the vertex A The electric intensity at C compared to that at B has A same magnitude and same direction B different magnitude but same direction C same magnitude but different direction D different magnitude and different direction 3 When two charges each equal to 1q are arranged at the two vertices of an equilateral triangle the mutual force between them is F The magnitude of the electric intensity due to these two charges at the third vertex is 3F A C B E decreases D E increases 4 Two infinitely long thin straight wires having uniform linear charge densities 2 and 22 are arranged parallel to each other at a distance r apart The intensity of the electric field at a point midway between them is 22 r 31 2mcr D zero A not zero but positive C not zero but negative remains constant decreases 2 5 The electric flux expressed in Nm C through a sphere that has a radius of 1 0 m and has a point charge of C at its centre is nearly A 3 6x10 C 3 6x10 B 3 6x10 D 3 6x10 6 A point charge q is located on the x axis at x a and a second point charge q is located on the x axis at x a A Gaussian surface with radius r 2a is centered at the origin The flux through this Gaussian surface is B zero D 2q 8 Next