Electric Charge...

The electric field at (30, 30) cm due to a charge of _8 nC at the origin in $${ NC }^{ -1 }$$ is

The force of repulsion between two points charges is $$F$$ , when these are $$1 m$$ apart. Now the point charges are replaced by conducting spheres of radii $$5 cm$$ having the charge same as that of point charges. The distance between their centers is $$1 m$$, then the force of repulsion will:- 

Two infinite linear charge are placed parallel at 0.1 m apart. It has density of 5 $$\mu$$ C/m,then the force per unit length of one of linear charges in N/m is;    

An infinite number of charges, each of charge $$1 \mu C ,$$ are placed on the $$x$$ -axis with co-ordinates $$x = 1,2,4,8 , \ldots \infty$$ a charge of 1$$C$$ is kept at the origin, then what is the net force acting on 1$$\mathrm { C }$$ charge

For two infinitely long charge parallel sheets, the electric field at $$P$$ will be

Point charges $$+q,\ +q$$ and $$-q$$ are placed at the corners $$A,\ B$$ and $$C$$ respectively of an equilateral triangle $$ABC$$. The resultant force on $$-q$$ placed at $$C$$ acts

There are Two charges +1 micro coulombs and +5 micrcoulombs. The ratio of the force acting on them will be  

A charge q is located at the center of a cube . The electric flux through any face is 

The force between two electrons when placed in air is equal to 0.5 times the weight of an electron find the distance between two electrons (mass is electron= $$9.1\times 10^{-31}kg)$$

Electric and magnetic field are directed as $${ E }_{ 0 }\hat { i } $$ and $${ B }_{ 0 }\hat { k } $$, a particle of mass m and charge +q is released from position $$(0, 2, 0)$$ from rest. The velocity of that particle at $$(x, 5, 0)$$ is $$\left( 5\hat { i } +12\hat { j }  \right) $$ the value of x will be