List of top Physics Questions on Electrostatic potential

The electrostatic potential energy of the electron in an orbit of hydrogen is −6.8 -6.8 eV. The speed of the electron in this orbit is (C is the speed of light in vacuum):
When a parallel plate capacitor is charged up to 95 V, its capacitance is C C . If a dielectric slab of thickness 2 mm is inserted between plates and the plate separation is increased by 1.6 mm such that the potential difference remains constant, find the dielectric constant of the material:
Electric field intensity and electric potential at a point due to a point charge are 600 V/m and -3600 V respectively. The distance of the point from the charge and the magnitude of the charge are:
“Introduction of a small charged sphere into a larger one allows us to keep piling up a larger and larger amount of charge on the latter” – This is the principle of the:
Two separated conducting spheres S1S_1 and S2S_2, of radii 3R/43R/4 and R/4R/4 having 15μC15 \mu C and −3μC-3 \mu C charges respectively are at a large distance. They are now connected by a conducting wire. After a long time, the charges on S1S_1 and S2S_2 respectively are:
A 200 volt battery is connected across the series combination of two capacitors 4 μ\muF and 6 μ\muF. The amount of energy stored in this series combination is:
In bringing a proton towards another proton, the electrostatic potential energy of the system
Two charges q1=2 μC q_1 = 2 \, \mu \mathrm{C} and q2=−3 μC q_2 = -3 \, \mu \mathrm{C} are placed 10 cm apart in a vacuum. What is the magnitude and direction of the force between them?
A hollow sphere of radius 'r' encloses an electric dipole composed of two charges +q and -q. The net flux of electric field through the surface of the sphere due to the enclosed dipole is:
For a uniformly charged thin spherical shell, the electric potential (V) radially away from the entre (O) of shell can be graphically represented as – For a uniformly charged thin spherical shell
Eight copper wire of length ll and diameter dd are joined in parallel to form a single composite conductor of resistance RR If a single copper wire of length 2l2 l have the same resistance (R)(R) then its diameter will be ______dd
Pick the correct graph between potential V at distance r from centre for the uniformly charged spherical shell of radius R.
 
graph
Two parallel plate capacitors of capacity CC and 3C3 C are connected in parallel combination and charged to a potential difference 18 V18\, V The battery is then disconnected and the space between the plates of the capacitor of capacity CC is completely filled with a material of dielectric constant 99 The final potential difference across the combination of capacitors will be______ VV
As shown in figure, a cuboid lies in a region with electric field E=2x2i^−4yj^+6k^N/CE=2 x^2 \hat{i}-4 y \hat{j}+6 \hat{k} N / C. The magnitude of charge within the cuboid is nϵ0Cn \epsilon_0 C. The value of nn is _____. (if dimension of cuboid is 1×2×3m31 \times 2 \times 3 m ^3 )
A cuboid electric Field
Which of the following Maxwell's equation is valid for time varying conditions but not valid for static conditions:

A point source of light is placed at the focus of a concave mirror. Consider only paraxial rays. The shapes of the wavefronts of incident and reflected lights respectively are: 

A current of 15 mA15 \,mA flows in the circuit asshown in figure The value of potentialdifference between the points AA and BB will be
Three identical particle A,BA, B andC C of mass 100 kg100 \,kg each are placed in a straight line with AB=BC=13 mAB = BC =13 \,m The gravitational force on a fourth particle PP of the same mass is FF, when placed at a distance 13 m13\, m from the particle B on the perpendicular bisector of the line ACAC The value of FF will be approximately :
The rms value of conduction current in a parallel plate capacitor is 69 μA69\, \mu A The capacity of this capacitor, if it is connected to 230 V230 \, V ac supply with an angular frequency of 600 rad/s600\, rad / s, will be :
Assertion (A): An electrical dipole is enclosed in a closed gaussian surface. The total flux through the enclosed surface is zero. 
Reason (R): Net charge inside the enclosed surface is zero.
Find linear charge density if infinite line charges produce a field of 9 x 104 and the distance is 2 cm.

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 10410^4 F and an inductor of 10−410^-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