Recent questions in Electrostatic Potential and Capacitance

Two concentric conducting spheres of radii R and 2R are carrying charges Q and -2Q respectively . If the charge on inner sphere is doubled the potential difference between the two spheres will becomes

asked Feb 7, 2014 by yamini.v

1 answer

A $4 \mu F$ capacitor and a 2.5MW resistor are connected in series with a 12V battery. Find the time after which the potential difference across the capacitor is 3 times the potential difference across the resistor.

asked Feb 6, 2014 by thanvigandhi_1

1 answer

Calculate the potential energy of the system shown in figure

asked Feb 6, 2014 by yamini.v

1 answer

An infinite number of charges each numerically equal to q and of the same sign are placed along the x-axis at $\;x=1 ,2 ,4 ,8----\;.$ Find elctric potential at $\;x=0$

asked Feb 6, 2014 by yamini.v

1 answer

At a certain distance from a point charge , the field intensity is $\;500 V/m\;$ and the potential is 1500 V . The magnitude of charge is

asked Feb 6, 2014 by yamini.v

1 answer

If the potential at the centre of a uniformly charged hollow sphere of radius R is V then electric field at a distance r from the centre of sphere will be $\;(r > R)$

asked Feb 6, 2014 by yamini.v

1 answer

The potential at a point x due to some charges situated on the x- axis is given by $\;V (x) = \large\frac{20}{(x^2-4)} volt\;$. The electric field at x = 4m is given by

asked Feb 6, 2014 by yamini.v

1 answer

A charge particle 'q' is shot towards another charged particle 'Q' which is fixed , with a speed 'v'.It approaches 'Q' upto a closest distance r and then returns . If q were given a speed of '2v' the closest distance of approach would be

asked Feb 6, 2014 by yamini.v

1 answer

Two identical particles , each having a charge of $\;2\times10^{-4}\;C\;$ and mass 10g are kept at a separation of 10 cm and released . What would be the speeds of the particles when the separation becomes large ?

asked Feb 5, 2014 by yamini.v

2 answers

The electric field and the electric potential at a point are E and V respectively

asked Feb 5, 2014 by yamini.v

1 answer

A point charge q is rotated along a circle in the electric field generated by another point charge Q . The work done by the electric field on the rotating charge in one complete revolution is

asked Feb 5, 2014 by yamini.v

1 answer

Electric potential has the dimensions of

asked Feb 5, 2014 by yamini.v

1 answer

Electric potential on the surface of a solid sphere of radius R is V . Then potential at $\;r=\large\frac{R}{2}\;$ is

asked Feb 5, 2014 by yamini.v

1 answer

Four charges q , -q , q , -q are placed in order on the four consecutive corners of a square of side a . The work done in interchanging the positions of any two neighbouring charges of the opposite sign is

asked Feb 5, 2014 by yamini.v

1 answer

The electrical potential existing in space is $\;V\;(x , y, z) = A\;(xy+yz+zx)\;$ . Find the expression for the electric field

asked Feb 5, 2014 by yamini.v

1 answer

A particle with kinetic energy $\;10\;MeV\;$ and charge $\;4e\;$ is heading towards a stationary nucleus of atomic number 100 . Calculate the distance of closest approach ?

asked Feb 4, 2014 by yamini.v

1 answer

A charge q is distributed uniformly on the surface of a sphere of radius R . It is covered by a concentric hollow conducting sphere of radius 2R . Find the charges on the outer surface of hollow sphere if it is earthed

asked Feb 4, 2014 by yamini.v

1 answer

Find the potential on the edge of a disc of charge density $\;\sigma$ and radius $R$

asked Feb 4, 2014 by yamini.v

1 answer

A disc having a uniform charge density $\;\sigma\;$ and radius $\;R\;$ is placed on $\;x-y\;$ plane with centre at the origin . Find the electric potential at a point on z - axis at a distance $\;10 m\;$ from centre . $\;\sigma=16\;\in_{0}\;,R=1 m$

asked Feb 4, 2014 by yamini.v

1 answer

Two point charges $\;q_{1}=q_{2}=2\;\mu C\;$ are fixed at $\;x_{1}= +3m \;and\;x_{2}=-3m\;$ as shown in figure . A third particle of mass 1g and charge $\;q_{3}=-4\;\mu C\;$ are released from rest at $\;y=4m \;$. Find the speed of the particle as it reaches the origin .

asked Feb 4, 2014 by yamini.v

1 answer

A uniform electric field of 100 V/m is directed at $30^{0}$ with the +ve x - axis as shown in figure . Find the potential difference $\;V_{BA}\;$ if OA=2 m and OB= 4 m

asked Feb 4, 2014 by yamini.v

1 answer

Consider the charging of a capacitor. Let $Q_1$ be the charge given to it in first t seconds and $Q_2$ be the charge given to it in the next t seconds. Also, let $t_1$ be the time required to deposit a charge Q (less than half the maximum charge) and $t_2$ be the time required to deposit an additional charge of Q, then:

asked Feb 3, 2014 by thanvigandhi_1

1 answer

The work done in placing a charge of $\;8\times10^{-18}\;$ coulomb on a condenser of capacity 100 micro-farad is

asked Feb 3, 2014 by yamini.v

1 answer

Two isolated charged conducting spheres of radii a and b produce the same electric field near their surfaces . The ratio of electric potential on their surfaces is

asked Feb 3, 2014 by yamini.v

1 answer