Two charges are placed a certain distance apart in air. If a glass slab is introduced between them, the force between them will:

What happens when some charge is placed on a soap bubble?

A body has a charge of $9.6 imes {10^{ - 20}}$ Coulomb. It is

Three charges each of magnitude $q$ are placed at the corners of an equilateral triangle, the electrostatic force on the charge placed at the center is (each side of triangle is $L$)

There are two charged identical metal spheres $A$ and $B$ repel each other with a force 3$imes {10^{ - 5}}$ N. Another identical uncharged sphere $C$ is touched with $A$ and then placed at the mid-point between $A$ and $B$. net force on $C$ is

When a body is earth connected, electrons from the earth flow into the body. This means the body is

A glass rod rubbed with silk is used to charge a gold leaf electroscope and the leaves are observed to diverge. The electroscope thus charged is exposed to $X$-rays for a short period. Then

Two small conducting sphere of equal radius have charges +10 $\mu$C and -20$\mu$C respectively and placed at a distance $R$ from each other experience force${F_1}.$ If they are brought in contact and separated to the same distance, they experience force ${F_2}.$ the ratio of ${F_1}$ to ${F_2}$ is

Equal charges $q$ are placed at the four corners $A,B,C,D$ of a square of length $a$. The magnitude of the force on the charge at $B$ will be

$N$ fundamental charges each of charge $\left( q \right)$ are to be distributed as two point charges separated by a fixed distance, then the maximum to minimum force bears a ratio ($N$ is even and greater than 2)

The charges on two spheres are $+ 7\mu C$ and $- 5\mu C$ respectively. They experience a force $F.$ If each of them is given and additional charge of $- 2\mu C$, the new force of attraction will be