Charge on $\alpha $ - particle is
$4.8 \times {10^{ - 19}}\,C$
$1.6 \times {10^{ - 19}}\,C$
$3.2 \times {10^{ - 19}}\,C$
$6.4 \times {10^{ - 19}}\,C$
Why charged particle attracts light particles ?
Write the activity to make simple electroscope.
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?
Give examples of non-conductors and conductors.