If a suspended object A is attracted to object B$,$ can we conclude that object A is charged?

YesNo$$

$($b$)$

The electric field is always zero $---$Select$---$inside$$just outside a perfect conductor.

$($c$)$

The charge density on the surface of an isolated, charged conductor is highest where the surface is $---$Select$---$sharpest$$smoothest $.$

TrueFalse$$

$($b$)$

All protons have a charge of $+$e$.$

TrueFalse$$

$($c$)$

Electrons in a conductor have a charge of $$e while electrons in an insulator have no charge.