Electrostatics MCQs for NEET — Physics Questions with Answers

An electron of mass m and charge e is accelerated from rest through a potential difference V in vacuum. The final speed of the electron will be 

Two equal charges q of opposite sign separated by a distance 2a constitute an electric dipole of dipole moment p. If P is a point at a distance r from the centre of the dipole and the line joining the centre of the dipole to this point makes an angle θ with the axis of the dipole, then the potential at P is given by (r >> 2a) (Where p = 2qa) 

A charge +q is fixed at each of the points $x=x_0,x=3x_0,x=5x_0$ ..... infinite, on the x-axis and a charge –q is fixed at each of the points $x=2x_0,x=4x_0,x=6x_0$,..... infinite. Here x₀ is a positive constant. Take the electric potential at a point due to a charge Q at a distance r from it to be $\frac{Q}{4\pi {\epsilon }_{0}r}$. Then, the potential at the origin due to the above system of charges is 

Inside a hollow charged spherical conductor, the potential -

Two small spheres each carrying a charge q are placed r meter apart. If one of the spheres is taken around the other one in a circular path of radius r, the work done will be equal to 

Two charged spheres of radii 10 cm and 15 cm are connected by a thin wire. No current will flow, if they have -

The electric field inside a spherical shell of uniform surface charge density is -

The electric potential V at any point O (x, y, z all in metres) in space is given by $V=4x^{2}volt$. The electric field at the point $(1m,0,2m)$ in volt/metre is -

A hollow metal sphere of radius 5 cm is charged so that the potential on its surface is 10 V. The potential at the centre of the sphere is -

If a unit positive charge is taken from one point to another over an equipotential surface, then -