Physics Electrostatic Potential and Capacitance

The force between two charged particle placed in air at separation x is F₀. Both the charged particle immerged in a medium of dielectric constant K without changing separation between two charge, then net force on one of the particle is now

Five  metallic plates each of area A and separated from adjacent plate by a distance d as shown in figure. The capacitance of the system across A and B is:

Two infinitely long parallel wires having linear charge densities λ₁ and λ₂ respectively are placed at a distance of R. The force per unit length on either wire will be

Electric  field  in  a  region  is  E = 3 ˆj N/ C . Equipotential surfaces are parallel to

Figure shows four plates each of area A and separated from another by a distance d. What is the capacitance between P and Q?

A $1\mu F$ capacitor is charged by $100V$ supply. It is then disconnected from the supply and is connected to another uncharged $1\mu F$ capacitor. The percentage of energy lost in form of heat and electromagnetic radiation is

In the diagram shown below, the block has charge $Q$ and is attached at one end of the light spring. The surface is smooth and horizontal and spring is in its natural length. If the electric field $E$ is switched on, the maximum elongation in the spring will be

For a region of constant electric potential, which of the following statements is incorrect?

Before connecting the circuit shown in figure all capacitors were uncharged. The circuit now is in steady state. Now the switch $S$  is closed. During the time the steady state is reached again:

Column?I	Column?II
i. Charge on C1	p. increases
ii. Charge on C2	q. decreases
iii. Charge on C3	r. remains same
iv. Charge on C4	s. becomes zero

Now, match the given columns and select the correct option from the codes given below.

Codes:

As shown in the figure below, a charge +2 C is situated at the origin O and another charge +5C is on the x?axis at the pint A. The latter charge from the point A is then brought to a point B on the y?axis. The work done is given $\frac{1}{4\pi {\epsilon }_0}=9*10^9\frac{m}{F})$