List of top Physics Questions on Electric charges and fields asked in BITSAT

Two concentric conducting spherical shells A and B having radii rA and rB (rB > rA) are charged to QA and -QB (|QB| > |QA|). The electric field along a line passing through the centre is 

The surface charge density of a thin charged disc of radius R is σ. The value of the electric field at the centre of the disc is (σ)/(2varepsilon₀). With respect to the field at the centre, the electric field along the axis at a distance R from the centre of the disc:
A solid sphere of radius R has a charge Q distributed in its volume with a charge density ρ = krᵃ, where k and a are constants and r is the distance from centre. If the electric field at r = (R)/(2) is (1)/(8) times that at r = R, the value of a is

The dipole moment of the given charge distribution is: 

Four point charges -Q, -q, 2q and 2Q are placed, one at each corner of the square. The relation between Q and q for which the potential at the centre of the square is zero is:

Two concentric conducting spherical shells A and B having radii rA and rB (rB>rA) are charged to +2q and -q respectively. The electric field along a line passing through the centre is 

The surface charge density of a thin charged disc of radius \( R \) is \( \sigma \). The value of the electric field at the centre of the disc is \( \dfrac{\sigma}{2\varepsilon_0} \). With respect to the field at the centre, the electric field along the axis at a distance \( R \) from the centre of the disc is:
A solid sphere of radius \(R\) has a charge \(Q\) distributed in its volume with a charge density \(\rho = kr\), where \(k\) and \(r\) are constants and \(r\) is the distance from its centre. If the electric field at \(r=\dfrac{R}{2}\) is \(\dfrac{1}{8}\) times that at \(r=R\), the value of \(a\) is:
Two point dipoles \(p\hat{k}\) and \(\frac{p}{2}\hat{k}\) are located at \((0,0,0)\) and \((1\,\text{m},0,2\,\text{m})\) respectively. The resultant electric field due to the two dipoles at the point \((1\,\text{m},0,0)\) is:
A uniform electric field and uniform magnetic field are acting along the same direction in a certain region. If an electron is projected in the region such that its velocity is pointed along the direction of fields, then the electron
The electric field intensity just sufficient to balance the earth’s gravitational attraction on an electron will be:

In a uniformly charged sphere of total charge Q and radius R, the electric field E is plotted as a function of distance r from the centre. Which graph correctly represents this variation?