A uniform current is flowing along the length of an infinite, straight, thin, hollow, cylinder of radius R. The magnitude field B produced at a perpendicular distance d from the axis of the cylinder is plotted in a graph. Which of the following looks like the plot?

A current I is flowing along an infinite, straight wire, in the positive Z-direction and the same current is flowing along a similar parallel wire 5 m apart, in the negative Z- direction. A point P is at a perpendicular distance 3 m from the first wire and 4 m from the second. What will be magnitude of the magnetic field vecB at P?

A very long charged solid cylinder of radius 'a' contains a uniform charge density rho . Dielectirc constant of the material of the cylinder is k .What will be the magnitude of electric field at a radial distance 'x'(xlta) from the axis of the cylinder ?

A thin spherical shel of radius R is charged with +q amount of charge. Use Gauss' law to find out the magnitude of the intensity of the electric field at a distance r from the centre of the shel, where (a) rlt R and(b) r gtR (ii) Show graphically how the magnitude of the intensity of the electric field changes with distance r from thke centre of the shell.