List of practice Questions

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
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 $q_2$.
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 $q_1$
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.
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?
What is the electric flux linked with closed surface ?
When a body is charged by induction, then the body
When a person combs his hair, static electricity is sometimes generated by what process?
Which of the following is best insulator ?
Which of the following statements about dipole moment is not true?
The equations $x^2 - ax + b = 0$ and $x^2 + bx - a = 0$ have a common root, then