List of top Physics Questions on Electric charges and fields

Consider a thin spherical shell of radius $R$ consisting of uniform surface charge density $\sigma$ The electric field at a point of distance $x$ from its centre and outside the shell is
Two point charges are $3\, m$ apart and their combined charge is $8 \mu C$. The force of repulsion between them is $0.012\, N$. Charges are
A charge situated at a certain distance along the axis of an electric dipole experience a force $F$. If the distance of the charge from the dipole is doubled, the force acting on it will become
Electrical force between two point charges is 200 N. If we increase 10% charge on one of the charges and decrease 10% charge on the other, then electrical force between them for the same distance becomes
A table tennis ball which has been covered with a conducting paint is suspended by a silk thread so that it hangs between two metal plates. One plate is earthed. When the other plate is connected to a high voltage generator, the ball
An electric dipole of moment $p$ is Iying along a uniform electric field $E$. The work done in rotating the dipole by $90^{\circ}$ is
Electric field at the centre of a uniformly charged semicircle of radius a is
If charge and distance between two charges are reduced to half. Force between them
If the electric flux entering and leaving an enclosed surface respectively are $\phi_{1}$ and $\phi_{2}$, the electric charge inside the surface will be
Two unlike charges of the same magnitude $Q$ are placed at a distance $d$. The intensity of the electric field at the middle point in the line joining the two charges
A charge $Q$ is to be divided into two parts, $q$ and $(Q- q)$, such that force between them is maximum. Then
The ratio of forces between two point charges in the two cases when their separation is halved and when it is doubled, is
An electric dipole coincides on $Z$-axis and its midpoint is on origin of the coordinate system. The electric field at an axial point at a distance $z$ from origin is $E_{(z)}$ and electric field at an equatorial point at a distance y from origin is $ E_{( y)} $. Here $ z = y > a, \, so \, \bigg | \frac{ E_{ (z) }}{ E_{(y)}} \bigg | = $ ...
If the uniform surface charge density on the infinite plane sheet is $\sigma$, electric field near the surface will be
A point charge causes an electric flux of $ -1.0 x\times 10^3 \, Nm^ 2 \, C^{-1} $ to pass through a spherical Gaussian surface of 10.0 cm radius centred on the charge. If the radius of the Gaussian surface were three times, how much flux would pass through the surface?
Consider a neutral conducting sphere. A positive point charge is placed outside the sphere. The net charge on the sphere is then
In a cavity within a conductor, the electric field is zero. Charges in a conductor reside only at its surface.
If the electric flux entering and leaving an enclosed surface respectively are $\phi_1 $ and $ \phi_2$ , the electric charge inside the surface will be
Emf of generator is $6 \,V$ and internal resistance is $0.5\, k \Omega$. If internal resistance of voltmeter is $2.5\, k \Omega$. then reading of voltmeter must be
A charge $q$ is located at the centre of a cube. The electric flux through any face is
An electron is moving round the nucleus of a hydrogen atom in a circular orbit of radius r. The Coulomb force F between the two is $ \bigg( {where} \, k = \frac{1}{ 4 \pi \varepsilon_0}\bigg)$
A solid metallic sphere has a charge $+3 Q$. Concentric with this sphere is a conducting spherical shell having charge $-Q$. The radius of the sphere is $a$ and that of the spherical shell is $b(b>a)$. What is the electric field at a distance $R(a
A square surface of side L m is in the plane of the paper. A uniform electric field \(\rightarrow\) E \(\bigg(\frac{V}{m}\bigg)\), also in the plane of the paper, is limited only to the lower half of the square surface, (see figure). The electric flux in SI units associated with the surface is :
A uniform rod of length l and mass m is free to rotate in a vertical plane about A. The rod initially in horizontal position is released. The initial angular acceleration of the rod is : (Moment of inertia of rod about A is \(\bigg(\frac{ml^2}{3}\bigg)\)
In the given circuit, what will be the equivalent resistance between the points $A$ and $B$ ?