The electric field intensity at a point in vacuum is equal to
Zero
Force a proton would experience there
Force an electron would experience there
Force a unit positive charge would experience there
A thin semi-circular ring ofradius $r$ has a positive charge $q$ distributed uniformly over it. The net field $\vec E$ at the centre $O$ is
Select the correct statement : (Only force on a particle is due to electric field)
Write equation of electric field by system of $\mathrm{'n'}$ charges.
How many electrons should be removed from a coin of mas $1.6 \,g$, so that it may float in an electric field of intensity $10^9 \,N / C$ directed upward?
A charged water drop whose radius is $0.1\,\mu m$ is in equilibrium in an electric field. If charge on it is equal to charge of an electron, then intensity of electric field will be.......$N/C$ $(g = 10\,m{s^{ - 1}})$