Question

a) Sketch electric lines of force due to (i) isolated positive change (ie q>0) and (ii) isolated negative change (ie q<0)
(b) Two point changes q and –q are placed at a distance 2a apart. Calculate the electric field at a point P situated at a distance r along the perpendicular bisector of the line joining the charges. What is the field when r >> a?
OR
(a) State Gauss’s law in electrostatics. Using Gauss's law, derive an expression for the electric field intensity at any point (i) outside (ii) inside (iii) at surface of a uniformly charged thin spherical shell of radius R and charge density σ. (b) A uniformly charged conducting sphere of 2.5 m in diameter has a surface charge density of 100μC/m2.Calculate the (i) Charge on the sphere (ii) Total electric flux passing through the sphere​

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