List of top Physics Questions on Electric Field

The electric field required to keep a water drop of mass in just to remain suspended, when charged with one electron:
Figure shows two charges q1 and –q2 placed on the x-axis as shown. If electric field at p is along x-direction, find \(\frac{q_1}{q_2}\)
two charges q1 and –q2 placed on the x-axis
Electrostatics -4q and +2q charges dipole present in uniform electric field direction of rotation and net force?
Let $\sigma$ be the uniform surface charge density of two infinite thin plane sheets shown in figure Then the electric fields in three different region $E_I, E_{I I}$ and $E_{I I I}$ are:
Four point charges (with equal magnitude of charge of $5\, C$; but with different signs) are placed at four corners of a square of side $10\, m.$ Assuming that the square is centered at the origin and the configuration of the charges are as given in the figure, the potential and the magnitude of electric field at the origin, respectively are [ Note : $k = \frac{1}{4 \pi \varepsilon_0}$]
An electron, placed in an electric field, experiences a force F of $1\, N.$ What are the magnitude and direction of the electric field E at the point where the electron is located $(e = 1.6 \times 10^{-19} C)$ ?
A conducting sphere of radius 10 cm has an unknown charge. If the electric field 20 cm from the centre of the sphere is \(1.5 × 10^3 NC^{-1}\) and points radially inward, what is the net charge on the sphere?
The electric field at a point is
Two point charges $ +8q$ and $-2q$ are placed as shown in the figure.
The point where the electric field is zero is
Two point charges of $1 \,\mu C$ and $-1\, \mu C$ are separated by a distance of $100\, ?$. A point $P$ is at a distance of $10 \,cm$ from the midpoint and on the perpendicular bisector of the line joining the two charges. The electric field at $P$ will be
Two point charges $Q$ and $-3Q$ are placed certain distance apart. If the electric field at the location of $Q$ be $\overrightarrow{E}$, then that at the location of $-3Q$ will be :
Two charges $q$ and $-3q$ are fixed on $x$-axis separated by distance $d$. Where should a third charge $2q$ be placed from $A$ such that it will not experience any force?
Three charge q, Q and 4q are placed in a straight line of length l at points distant 0, $\frac{1}{2}$ and l respectively from one end. In order to make the net froce on q zero, the charge Q must be equal to
The unit of permittivity is same as that of
The nucleus of helium atom contains two protons that are separated by distance $3.0 \times 10^{-15}\, m$. The magnitude of the electrostatic force that each proton exerts on the other is
The force per unit charge is known as
The electric field components in the given figure are $E_x = \alpha x^{1/2}$, $E_y = E_z = 0$ in which $\alpha = 800\, N\, C^{-1}\, m^{-1/2}$. The charge within the cube if net flux through the cube is $1.05\, N\, m^2\,C^{-1}$ (assume $a = 0.1\, m$)
The electric field intensity at a point $P$ due to point charge $q$ kept at point $Q$ is $24 \,N \,C^{-1}$ and the electric potential at point $P$ due to same charge is $12\, J \,C^{-1}$. The order of magnitude of charge $q$ is
The electric field strength at a distance r from a charge q is E. What will be electric field strength if the distance of the observation point is increased to 2 r?