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
The divergence of leaves will not be affected
The leaves will diverge further
The leaves will collapse
The leaves will melt
A soap bubble is given a negative charge, then its radius
What is point charge ?
If a body is charged by rubbing it. Its weight
How can object be charged with contact ?
Find change in mass of a body if it is given $+2C$ charge.