List of top Physics Questions on Electrostatic potential asked in KCET

You are given a dipole of charge \( +q \) and \( -q \) separated by a distance \( 2l \). A sphere 'A' of radius \( R \) passes through the centre of the dipole as shown below and another sphere 'B' of radius \( 2R \) passes through the charge \( +q \). Then the electric flux through the sphere A is 

A proton moves with a velocity of 5 x 106 j m/s, through the uniform electric field E = 4 x 106 (2i + 0.2j + 0.1k) Vm-1and the uniform magnetic field B = 0.2( i + 0.2 j + k) T. The approximate net force acting on the proton is

Four charges +q, +2q, +q and -2q are placed at the corner of square ABCD respectively. The force on unit positive charge kept at the centre 'O' is

Which of the following radiations of electromagnetic waves has the highest wavelength ?

In a series LCR Circuit R = 300 Ω, L = 0.9 H, c = 2.0 µF and w = 1000 rad/sec. Then the impedance of the circuit is 

A series resonant ac circuit contains a capacitance \(10^4\) F and an inductor of \(10^-4\) H. The frequency of electrical oscillations will be

A long solenoid has 500 turns, when a current of 2A is passed through it, the resulting flux linked with each turns of solenoid is 4 x 10-3 Wb, then the self induction of solenoid is

An alternating current is given by i = i1 sin ωt + i2 cos ωt. The r.m.s. current is given by 

A circular coil of wire of radius 'r' has 'n' turns and carries a current ' I '. The magnetic induction 'B' at a point on the axis of the coil of distance √3 r from its center is

A charged particle is moving in an electric field of \(3 \times 10^{-10} \, \text{V} \, \text{m}^{-1}\) with mobility \(2.5 \times 10^{-6} \, \text{m}^2/\text{V}/\text{s}\) . Its drift velocity is

Two tiny sphere carrying a charges 1.8 µC and 2.8 µC are located at 40 cm apart. The potential at the mid-point of the line joining the two charges is 

An electric dipole with dipole moment 4 x 10-9 Cm is aligned at 30 degree with the direction of the uniform electric field of magnitude 5 x 104 NC-1. The magnitude of the torque acting on the diapole is 

A tiny spherical oil drop carrying a net charge q is balanced in still air with a vertical uniform electrical field of strength \(\frac{81}{7}\pi\) x 105 V/m.When the field is switched off, the drop is observed to fall with terminal velocity 2 x 10-3 m/s. Here g = 9.8 m/s2, viscosity of air is 1.8 x 10-5 N/m2 and the density of the oil is 900 kg/m3. The magnitude of 'q' is 

A potentiometer has a uniform wire of length 5m. A battery of emf 10V and negligible internal resistance is connected between its ends. A secondary cell connected to the circuit gives balancing length at 200cm. The emf of the secondary cell is
A train whistling at constant frequency 'n' is moving towards a station at a constant speed V. The train goes past a stationary observer on the station. The frequency 'n' of the sound as heard by the observer is plotted as a function of time 't'. Identify the correct curve
The work done to move a charge on an equipotential surface is
Two point charges $A = +3\, nC$ and $B = +1\, nC$ are placed $5\,cm$ apart in air. The work done to move charge $B$ towards $A$ by $1\,cm$ is
Two concentric spheres of radii $R$ and $r$ have positive charges $q_1$ and $q_2$ with equal surface charge densities. What is the electric potential at their common centre ?
There is a uniform electric field of intensity $E$ which is as shown. How many labelled points have the same electric potential as the fully shaded point?