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Recent questions tagged electrostatic-potential-and-capacitance

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

Electric potential is given by $\;V=2x^2\;$ Find the electric field at $\;(1 ,0 ,2)\;$ in Volt/metre.

asked Jan 31, 2014 by yamini.v

1 answer

If there are n capacitors in parallel connected to V volt source , then energy stored is equal to

asked Jan 30, 2014 by yamini.v

1 answer

If a charge is shifted from a low potential region to high potential region , the electric potential energy

asked Jan 30, 2014 by yamini.v

1 answer

Metallic sphere of radius R is charged to potential V . The charge q is proportional to

asked Jan 30, 2014 by yamini.v

1 answer

Electric field and potential inside hollow charged conducting sphere are respectively

asked Jan 30, 2014 by yamini.v

1 answer

On moving a charge of 100 coulombs by 10 cm , 5 J of work is done , then the potential difference between the points is

asked Jan 30, 2014 by yamini.v

1 answer

In a certain region V= $\;Axy+Bx^2+Cy\;$ where A , B , C are constants . Find electric field as a function of $\;(x ,y ,z)\;.$

asked Jan 30, 2014 by yamini.v

1 answer

Electric potential at a point P , due to a point charge q at A at distance r from P is V . Then if double of this charge is uniformly distributed on a hollow sphere of radius 2r centered at A then potential at P due to sphere is

asked Jan 30, 2014 by yamini.v

1 answer

729 drops of same size are charged to a potential of 1 V each . If they coalesce to form a single drop , its potential would be

asked Jan 30, 2014 by yamini.v

1 answer

Three identical charges $\;(q)\;$ are placed at corners of an equilateral triangle of side l . Find the work require to double the dimensions of traingle

asked Jan 30, 2014 by yamini.v

1 answer

A ring of radius R is having charges $\; q \;and \; 3 q\;$ distributed on its two half parts . The electric potential at a point on the axis $\;\sqrt{3}\;R\;$ from its centre is

asked Jan 29, 2014 by yamini.v

1 answer

A proton , a deutron and alpha particle are accelerated through potentials of $\;V , 2V ,4V\;$respectively . Their velocity will bear a ratio .

asked Jan 29, 2014 by yamini.v

1 answer

The electric field in a region is given by $\;\overrightarrow{E}=5 \hat{i} - 3 \hat {j}\;.$ Find $\;V_{B}-V_{A}\;.$ If A is origin & B is $\;(0,0,5)\;m$

asked Jan 29, 2014 by yamini.v

1 answer

An electric field $\;\overrightarrow{E}=(2 \hat{i}+3\hat{j})\;N/C$ exists in space . if the potential at the origin is zero , find the potential at $\;(2 ,2 )\;m$

asked Jan 29, 2014 by yamini.v

1 answer

When the separation between two charges is increased the electric potential energy of the charges

asked Jan 29, 2014 by yamini.v

1 answer

A charge $-q$ is fixed at each of the points $x= 2 m,x=4m,x=6m.... $ up to infinity and charge $+q$ is fixed at each of the points $x=1 m ,x= 3m , x=5m....$ up to infinity. The potential at the origin will be :

asked Jan 15, 2014 by meena.p

1 answer

The force of attraction between the plates of parallel plate capacitor having area A and charge Q is given by

asked Jan 15, 2014 by meena.p

1 answer

A capacitor of capacitance $C_0$ is charge to potential $V_0$ and then isolated . A small capacitor C is charged from $C_0$, discharge and then charged again; this process is repeated n times. Due to this potential of $C_0$ decreases to r. Value of C is :

asked Jan 15, 2014 by meena.p

1 answer

If electric field $\overrightarrow{E} = 2\hat i +3 \hat j $ , Potential difference between two point $V_A- V_B$, where $r_A=\hat i+ 2 \hat j $ and $r_B=2 \hat i +\hat j + 3 \hat k $ will be

asked Jan 15, 2014 by meena.p

1 answer

The capacitor plates are fixed on inclined plane p connected to a battery of emf E. A dielectric slab of mass m and dielectric constant k is inserted into the capacitor and tied to mass M using a weightless string as shown. If capacitance have plate area A, length l and distance d between them. Find M such that slab stays in equilibrium. Assume zero friction between slab and plates

asked Jan 13, 2014 by meena.p

1 answer

A ring of radius R carries charge $+q$ uniformly distributed on it. If a charge $- 90$ is released on ring's axis at a distance $\sqrt 3 R$ from its centre , the kinetic energy of $-90$ when it reaches the centre of ring will be :

asked Jan 13, 2014 by meena.p

1 answer

Six plates of same area A are arranged as shown. Equivalent capacitance of arrangement between A and B is :

asked Jan 13, 2014 by meena.p

1 answer

A uniform electric field of $200 \;Vm^{-1} $ is directed $60^{\circ}$ to $+ve$ X-axis . If $OA=2 m, V_0-V_A$ is

asked Jan 13, 2014 by meena.p

1 answer

Three concentric spherical conductors are shown, Find equivalent capacitance b/w A and B

asked Jan 13, 2014 by meena.p

1 answer

A cylindrical layer of homogeneous dielectric with dielectric constant K is introduced in a cylindrical capacitor so that a gap of width d is filled in between them. Radius of plate $R > > d$. If the capacitor is connected to battery of EMF V, the force pulling the dielectric inside the capacitor is :

asked Jan 13, 2014 by meena.p

1 answer

In the circuit given below, the position of switch S is shifted from 1 to 2 . choose the correct statement

asked Jan 10, 2014 by meena.p

1 answer

A thin metal sheet is placed between the plates of a parallel plate capacitor. Its capacitance will

asked Jan 10, 2014 by meena.p

1 answer

Potential difference between points A and B is 5V, then voltage across $2 \mu F$ capacitor is :

asked Jan 10, 2014 by meena.p

1 answer

Three identical metal plates are kept parallel to one another at seperation $d_1\; and\; d_2 $ If both the outer plates are connected to ground and middle plate is given charge q, The charge on right side of middle plate will be :

asked Jan 10, 2014 by meena.p

1 answer

Find the equivalent capacitance between A ans B ,each capacitor having capacitance C.

asked Jan 10, 2014 by meena.p

1 answer

A metal sphere of radius $r_1$ is charged to potential $V_1$ and enclosed in thin spherical shell. If metal sphere is connected to shell by a conductor the potential of shell will be :

asked Jan 8, 2014 by meena.p

1 answer

Capacitors $C1$ and $C2$ are joined as shown below. If potential at point A i $V_A$ and point B is $V_B$, Potential at point C is

asked Jan 8, 2014 by meena.p

1 answer

The capacitance of capacitors of plate area $A_2 and A_1 (A_2 < A_1) $ at a distance l is

asked Jan 8, 2014 by meena.p

1 answer

If electric field $\overrightarrow {E} =( y \hat i + x \hat j ),$ the potential field is

asked Jan 8, 2014 by meena.p

1 answer

Capacitance of capacitor becomes $\large\frac{4}{3}$ times its original value if a dielectric slab of thickness $\large\frac{d}{2}$ is inserted b/w the plates (d= seperation between the plates) . The dielectric constant of the slab is:

asked Jan 8, 2014 by meena.p

1 answer

If two conducting spheres are seperately charged and then brought in contact

asked Jan 8, 2014 by meena.p

1 answer

The electric potential V at any point (x,y,z) in space is given by $V= gx^2\; volt$. Electric field at $ (2,0,5) m $ in $Vm^{-1}$ is :

asked Jan 8, 2014 by meena.p

1 answer

What is effective capacitance between A and B

asked Jan 8, 2014 by meena.p

1 answer

125 drops of water of same radius and same charge combine to form a big drop. Ration of potential of big drop to the potential of small drop.

asked Jan 8, 2014 by meena.p

1 answer

In that below diagram $C_1= 4 \mu F, C_2 =12 \mu F, C_3=8 \mu F$ Energy consumed in charging these capacitors is :

asked Jan 8, 2014 by meena.p

1 answer

A charge Q and another charge q are placed at two points A and B which are distance l apart. Keeping q stationary at B, Q is moved to point C such that ABC forms equilateral triangle of side l. Find the net work done ?

asked Jan 8, 2014 by meena.p

1 answer

A hollow conducting sphere of radius R has a charge $+Q$ as its outer surface. Inside the sphere at $r= \large\frac{R}{4}$ from its centre the value of electric potential will be :

asked Jan 8, 2014 by meena.p

1 answer

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