The electric flux on a Gaussian spherical surface of radius 15 cm, drawn with a point charge as the centre, is ф. If the radius of this surface is tripled, then the electric flux passing through the surface will be:
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Electric Charges and Fields questions
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The value of dielectric strength for air is:
The SI value of electrical conductivity of free space or vacuum is:
The SI unit of electric flux is:
The magnitude of the electric field due to a point charge at a distance of 4.0 m is 9 N/C. Distance of this point charged substance due to electric field of magnitude 16 N/C will be:
Write the formula to determine the value of electric field intensity due to a uniformly charged thin spherical shell.
Write the value of the electric field due to an electric dipole at a point situated on its axis.
Draw lines of force due to point charges when
(i) $q<0$ and (ii) $q>0 . \quad$
View full solution →(i) $q<0$ and (ii) $q>0 . \quad$
Can a metal sphere of radius 1 em be given a charge of IC?
The flux inside a balloon of radius 7.0 cm is 2.0 - $10^3 NmC ^{-1}$. If the radius of the balloon is doubled, what will be the value of flux?
View full solution →A cylindrical surface of radius $r$ and length $l$ contains a thin, straight conducting wire of charge density $\lambda$ of infinite length. The axis of the cylindrical surface coincides with the length of the wire. Find the expression for electric flux through a cylindrical surface.
View full solution →Two electric charges $+Q$ and $-Q(x-y)$ are placed at the points $\left(-x_2, 0\right)$ and $\left(x_1, 0\right)$ respectively in the plane. Find the magnitude and direction of the resultant electric field at the origin $(0,0)$.
View full solution →Draw the graph of variation of Coulomb force (F) with $(r)$. Where the distance between the two charges of each charge pair is ( $1 \mu C , 2 \mu C$ ) and ( $2 \mu C$, $-3 \mu C$ ). Analyse the graph obtained.
View full solution →A force F facts on a point charge placed on the axis of an electric dipole. If the distance of a point charge from the dipole is doubled, what will be the force on it? Explain the reason also.
The volume charge density in the space between two conocentric spheres of radii $a$ and $b$ is $\rho=\frac{A}{r}$, where $A$ is a constant and $r$ is the distance. There is a point charge $Q$ at the centre of the sphere. Find the value of A such that there is a uniform electric field in the space between the spheres.
View full solution →Two electric charges $+Q$ and $-Q(x-y)$ are placed at the points $\left(-x_2, 0\right)$ and $\left(x_1, 0\right)$ respectively in the plane. Find the magnitude and direction of the resultant electric field at the origin $(0,0)$.
View full solution →A system has two charges $q_A=2.5$$\times 10^{-7} C$ and $q_B=-2.5 \times 10^{-7} C$ located at points A: $(0$,$0,-15 cm)$and $B :( 0 , 0 ,+15 cm)$, respectively. What are the total charge and electric dipole moment of the system?
View full solution →When a glass rod is rubbed with a silk cloth, charges appear on both. A similar phenomenon is observed with many other pairs of bodies. Explain how this observation is consistent with the law of conservation of charge.
(a) Explain the meaning of the statement "electric charge of a body is quantised". (b) Why can one ignore quantisation of electric charge when dealing with macroscopic i.e., large scale charges?
An infinite line charge produces a field of 9 x104 N C-1at a distance of 2 cm. Calculate the linear charge density.
A charge of $1.6 \times 10^{-7} C$ is uniformly distributed on the surface of a spherical conductor of radius 12 cm . What will be the electric field?(a) Inside the sphere(b) Just outside the sphere(c) At any point located 18 cm from the centre of the sphere.
View full solution →An electric charge of $17.7 \times 10^{-4}$ Coulomb is distributed uniformly on a large thin sheet of area $200 m^2$. Find the intensity of the electric field in air at a distance of 20 cm from it.
View full solution →Two cations with equal charge repel each other with a force of $3.7 \times 10^{-9}$ Newton while the distance between them is $5 A$. How many electrons are less in each ion than in the normal state?
View full solution →The charge density of two uniformly charged parallel infinite plane sheets ' 1 ' and ' 2 ' are $+\sigma$ and $-2 \sigma$ respectively. Find the magnitude and direction of the net electric field (i) at any point between these two sheets and (ii) at any point outisde these two sheets but near sheet ' 1 '.
View full solution →The radius of a thin hollow metal sphere (spherical shell) is 30 cm . And there is a charge of 500 $\mu C$ on that spherical shell. Find the electric field intensity at a distance.(i) 1 meter, (ii) 30 cm , (iii) 10 cm , from the centre of the cell.
View full solution →By defining electric dipole and dipole moment, find the necessary formula for the field intensity at any point located on the neutral (equatorial plane) of the dipole.
Write the statement of Gauss's law for electrostatics. Draw a diagram and derive an expression for the electric field due to a uniformly charged infinite plane sheet at a point near it.In the given figure, write the value of electric flux emerging from the surface :
Prove that due to a charged layer of infinite expansion, the value of the electric field at any point near it does not depend on the area of the surface and the distance from the layer . i.e., the electric field remains uniform at points near the layer.###Write Gauss'law.By applying this rule,find the value of the electric field due to a uniformly charged infinite plane sheet at any point near the sheet.
What is Gauss theorem? With its help, obtain an expression for the electric field intensity at any point near a uniformly charged linear conductor of infinite length.###Make the necessary diagram and with the help of Gauss law, calculate the electric field intensity at any point due to a charged wire of infinite length. Plot the change in intensity with distance.###Define Gauss' law. With its help, find the value of electric field intensity at a distance from a uniformly charged linear conductor of infinite extension. Make the necessary diagram and also make a graph of the change of electric field with distance.
What is meant by electric field lines? Give examples of electric field lines due to different charge distributions and also write their characteristics.
The field lines due single positive charge are radially ___________.
The direction of the area vector is _____________ to the region.
If the electron and proton are kept in the same electric field, the acceleration of _________ will be greater.
Electric dipole moment is a __________ quantity.
If a dielectric material is placed between two positive charges placed in air, the repulsion force between them will be __________.
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