Two this parallel threads carry a uniform charge with linear densities `lamnda` and `-lambda` . The distance between the threads is equal to `l`. Find the potential of the electric field and the magnitude of its strength vector at the distance `r gt gt l` at the angle `theta` to the vector 1 (fig).

Each of the two long parallel threads carries a uniform lambda per unit length. The threads are separated by a distance l. Find the maximum magnitude of the electric field strenght in the symmetry plane of this system located between the threads.

Each of the two long parallel threads carries a uniform charge lambda per unit length. The threads are separated by a distance l . Find the maximum magnitude of the electric firld strength in the symmetry plane of theis system located between the threads.

Two infinitely long thin styraight wires having uniform linear charge densities lambda and 2lambda are arranged parallel to each other at a distance r apart.The intensity of the electric field at a point midway between them is

Two infinitely long thin straight wires having uniform linear charge densities lambda and 2lambda are arranged parallel to each other at a distance r apart.The intensity of the electric field at a point midway between them is

Two infinite parallel metal plates, contain electric charges with charge densities +sigma and -sigma respectively and are seperated by a small distance. Then the magnitude of the electric field between the two planes with its direction will be -

A thin infinitely long thread carrying a charge lambda per unit length is oriented parallel to the infinite conducting plane. The distance between the thread and the plane is equal to l . Find : (a) the moducles of the vector of the force acting on a unit length of the thread , (b) the disribution of surface chagre density sigma (x) over the plane, where x is the distance form the plane perpendicular to the conducting surface and passing through the thread.

A thread carrying a uniform charge lambda per unit length has the configuration as shown in figure. If radius ‘R’ is considerably length 'the length of the thread then find the magnitude of the electric field strength at the point O. (O is the centre of the quarter circular arc).