List of top Physics Questions on Electric charges and fields

A thin, metallic spherical shell contains a charge Q on it. A point charge q is placed at the centre of the shell and another charge $q_1$ is placed outside it as shown in figure. All the three charges are positive . The force on the charge at the centre is
A uniformly charged conducting sphere of $4.4\,m$ diameter has a surface charge density of $60\, \mu C\, m^{-2}$. The charge on the sphere is
An electron and a proton are situated in a uniform electric field. The ratio of their acceleration will be
A deuteron and an a-particle are placed in an electric field. If $F_1$ and $F_2$ be the forces acting on them and $a_1$ and $a_2$ be their accelerations respectively then, $a_1 = a_2$. Forces will be same in electric field.
Four point charges $q_1, q_2, q_3$ and $q_4$ are as shown in figure. The flux over the shown Gaussian surface depends only on charges $q_1$ and $q_2$. Electric field at all points on Gaussian surface depends only on charges $q_1$ and $q_2$.
In the absence of an external electric field, the dipole moment per unit volume of a polar dielectric is zero. The dipoles of a polar dielectric are randomly oriented.
Charge $q$ is uniformly distributed over a thin half ring of radius $R$. The electric field at the centre of the ring is
Coulomb?? law is true for
Debye is the unit of
Electric field lines provide information about
Electric lines of force about a negative point charge are
Figure below shows a closed surface which intersects a conducting sphere. If a positive charge is placed at the point P, the flux of the electric field through the closed surface
Figure shows electric field lines in which an electric dipole $\vec{p}$ is placed as shown. Which of the following statements is correct?
Five charges $q_1$, $q_2$, $q_3$, $q_4$ and $q_5$ are fixed at their positions as shown in figure. $S$ is Gaussian surface. The Gauss?? law is given by $\oint_{_{_s}}\vec{E}\cdot\vec{ds}=\frac{q}{\varepsilon_{0}}$. Which of the following statements is correct?
Five styrofoam balls are suspended from insulating threads. Several experiments are performed on the balls and the following observations are made - (i) Ball A repels C and attracts B (ii) Ball D attracts B and has no effect on E (iii) A negatively charged rod attracts both A and E. An electrically neutral styrofoam ball gets attracted if placed nearby a charged body due to induced charge. What are the charges, if any, on each ball?
Four point charges are placed at the corners of a square $ABCD$ of side $10\, cm$, as shown in figure. The force on a charge of $1\,\mu C$ placed at the centre of square is
If $10^9$ electrons move out of a body to another body every second, then the time required to get a total charge of $1\,C$ on the other body is
If a body is charged by rubbing it, its weight
If a body is positively charged, then it has
If an electron has an initial velocity in a direction different from that of an electric field, the path of the electron is
In a medium of dielectric constant K, the electric field is $\vec{E}$ . If $\in_0$ is permittivity of the free space, the electric displacement vector is
In figure, two positive charges, $q_2$ and $q_3$ fixed along the $y$ axis, exert a net electric force in the $+x$ direction on a charge $q_1$ fixed along the $x$ axis. If a positive charge Q is added at ($x$, $0$), the force on $q_1$
Object may acquire an excess or deficiency of charge by
On charging by conduction, mass of a body may
What happens when some charge is placed on a soap bubble?