Electric Field Strength due to a charged circular arc at its centre

Electric Field Strength due to a uniformly Charged Rod

At an axial point:

At an equatorial point: To find the electric field due to a rod at a point P situated at a distance 'r' from its centre on its equatorial line

Electric Field due to a Uniformly Charged Ring

The intensity of electric field at a distance x meters from the centre along the axis:

At its centre x = 0
∴Electric field at centre is zero.