What are called conductors and non-conductors ? In which free electrons are more ? Conductor or non-conductor.
What is called electrostatics ?
By which instrument, the charge on object can be detected ?
A girl brings a positively charged rod near a thin neutral stream of water from a tap. She observes that the water stream bends towards her. Instead, if she were to bring a negatively charged rod near to the stream, it will
A polythene piece rubbed with wool is found to have a negative charge of $3 \times 10^{-7} \;C$
$(a)$ Estimate the number of electrons transferred (from which to which?)
$(b)$ Is there a transfer of mass from wool to polythene?
How much positive and negative charge is there in a cup of water $(250\;gm)$?