When a conducting soap bubble is negatively charged then
Its size starts varying arbitrarily
It expands
It contracts
No change in its size takes place
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 minimum charge on an object is
Write definition of unit Coulomb.
Discuss the method of charging of two spheres by without contact method.
Which of the following is not true about electric charge?