The intensity of electric field due to a proton at a distanceof 0.2 ran is :
2.
Force acting upon a charged particle, kept between the charged pair of plates is F. If one of the plates is removed, the force acting on the same particle will become :
3.
Two-point charges + 4e and e are kept at distance x apart. At what distance a charge q must be placed from charge+ e so that q is in equilibrium:
4.
A charge q = 8.75 pC in an electric field is acted upon by a force F = 4.5 N, the potential gradient at this point is :
5.
A ring made of wire with a radius of 10 cm is chargednegatively and carries a charge of - 5 x 10-9 C. Thedistance from the centre to the point on the axis of thering where the intensity of the electric field is maximum,will be :
