Select the correct statement : (Only force on a particle is due to electric field)
A charged particle always moves along the electric line of force.
A charged particle may move along the line of force
A charge particle never moves along the line of force
A charged particle moves along the line of force only if released from rest.
What is the magnitude of a point charge due to which the electric field $30\,cm$ away has the magnitude $2\,newton/coulomb$ $[1/4\pi {\varepsilon _0} = 9 \times {10^9}\,N{m^2}/{C^2}]$
The maximum value of electric field on the axis of a charged ring having charge $Q$ and radius $R$ is
The charge per unit length of the four quadrant of the ring is $2\ \lambda , - 2\ \lambda , \lambda$ and $- \lambda$ respectively. The electric field at the centre is
A small metal ball is suspended in a uniform electric field with the help of an insulated thread. If high energy $X$ -ray beam falls on the ball, then the ball
The insulation property of air breaks down at $E = 3 \times {10^6}$ $volt\,/\,metre$. The maximum charge that can be given to a sphere of diameter $5\,m$ is approximately (in coulombs)