A charged gold leaf electroscope has its leaves apart by certain amount having enclosed air. When the electroscope is subjected to $X$-rays, then the leaves
Further dilate
Start oscillating
Collapse
Remain unaltered
Write definition of unit Coulomb.
Discuss the historical observation of frictional electrics.
Number of electrons in one coulomb of charge will be
How much positive and negative charge is there in a cup of water $(250\;gm)$?
A soap bubble is given a negative charge, then its radius