(a) The charges each `Q` are placed at `x - d , 2d , 4d ,…oo`. Find electric potential at origin `O`.
(b) A charge `+Q` is placed at each of the points `x = d , x = 3d ,x = 5d ,…..,oo` on the `x`-axis , and a charge `-Q` is placed at each of the points `x = 2d , x = 4d , x= 6d , ...,oo`.Find the electric potential at the origin `O`.

A charge +q is fixed at each of the points x=x_0 , x=3x_0 , x=5x_0 ,………… x=oo on the x axis, and a charge -q is fixed at each of the points x=2x_0 , x=4x_0 , x=6x_0 , ………… x=oo . Here x_0 is a positive constant. Take the electric potential at a point due to a charge Q at a distance r from it to be Q//(4piepsilon_0r) .Then, the potential at the origin due to the above system of

A charge q is placed at point D of the cube. Find the electric flux passing through the EFGH and face AEHD .

3 charges are placed in a circle of radius d as shown in figure. Find the electric field along x-axis at centre of circle.

3 charges are placed in a circle of radius d as shown in figure. Find the electric field along x-axis at centre of circle.

The charges - q, Q, -q are placed along x-axis at x = 0, x = a and x = 2a. If the potential energy of the system is zero, then Q:q is

Four monochromatic and coherent sources of light, emitting waves in phase of wavelength lambda , are placed at the points x = 0, d 2d and 3d on the x-axis. Then

Two large identical plates are placed in front of each other at x = d and x = 2d as shown in the figure. If charges on plates are Q and -5Q , the potential versus distance graph for region x = 0 to x = 3d is (d is very small and potential at x = 0 is v_0 )

Four charges of +q, +q, +q and +q are placed at the corners A, B, C and D of a square of side a. Find the resultant force on the charge at D

Two point charges (Q each are placed at (0,y) and (0-y) A point charge q of the same polarity can move along the x-axis. Then

A point charge q_1 = + 2muC is placed at the origin of coordinates. A second charge, q_2 = - 3muC , is placed on the x-axis at x = 100cm . At what point (or points) on the x-axis will the absolute potential be zero?