Electric Charge...

A charge of $$10$$ $$units$$ is divided so that force between the two charges is maximum when placed $$2$$ $$cm$$ apart. The two charges are:

The electric field in a region of space is given by $$\vec{E}=(\hat{5i}+\hat{2j}  )Nc^{-1}$$ . The electric flux due to this field through an area $$2m^{2}$$ lying in the Y-Z plane in S.I. units is

A charge $$Q$$ is divided into two parts $$q_{1}$$ and $$q_{2}$$ such that they experience maximum force of repulsion when separated by certain distance. The ratio of $$Q, q_{1}$$ and $$q_{2}$$ is :

Two alpha particles are separated by a distance of $$10^{-13}m$$. The force between them in free space is :

The excess (equal in number) number of electrons that must be placed on each of the two small spheres spaced $$3 cm$$ apart with a force of repulsion between them to be $$10^{-19} N$$ is :

Two charges each of $$100$$ micro coulomb are separated in a medium of relative permittivity $$2$$ by a distance of $$5 cm$$. The force between them is :

Two equally charged pith balls $$3\ cm$$ apart repel each other with a force of $$4\times10^{-5}\ N $$. The charge on each ball is

$$Q_{1},Q_{2}$$ charges are separated by distance $$‘d’$$. $$F$$ is the force between them. Now the value of $$Q_{2}$$ is halved. To have the same force between the charges, the distance of separation should be :

Two unlike charges separated by a distance of $$1m$$ attract each other with a force of $$0.108N$$. If the charges are in the ratio $$1:3$$, the weak charge is :

Two charges $$2C$$ and $$6C$$ are separated by a finite distance. If a charge of $$-4C$$ is added to each of them, The initial force of $$12 \times10^{3}N$$ will change to :