Electric fields and charges practice · Medium

Statement-1: Electric field outside the uniformly charged spherical shell (due to shell) is the same as that of a point charge at its center.
Statement-2: The centre of mass of uniform shell is at its center.

A mass of $1 \mathrm{~kg}$ carrying a charge of $2 \mathrm{~C}$ is accelerated through a potential of $1 \mathrm{~V}.$ The velocity acquired by it is:

Five balls numbered 1 to 5 are suspended using separate threads. Pairs $(1,2),(2,4)$ and $(4,1)$ show electrostatic attraction, while pair $(2,3)$ and $(4,5)$ show repulsion. Therefore ball 1 must be

Under the action of a given coulombic force the acceleration of an electron is $2.5 \times {10^{22}}\mathrm{m}/{\mathrm{s}^2}.$ Then the magnitude of acceleration of a proton under the action of same force is nearly

The magnitude of electric field intensity at a point outside uniformly charged thin infinite plane sheet is independent of

A point charge $q$ produces an electric field of magnitude $2$ $\mathrm{N}{\mathrm{C}^{ - 1}}$ at a point distance $0.25\;\mathrm{ }m$ from it. What is the value of charge?

Statement-1: When a charge is placed at rest in an electric field its path will always be along electric line of force.
Statement-2: The force on the charge is along the tangent drawn on electric field line.

A certain charge $Q$ is divided into two parts let’s say $q_1$ and $q_2$ then these two point charges are placed at a certain distance apart. The ratio $\frac{{{q_1}}}{{{q_2}}},$ for which the electrostatic force between them will be maximum

Four metal conductors having different shapes 1. A sphere 2. Cylindrical 3. Pear 4. Lightning conductor Are mounted on insulating stands and charged. The one which is best suited to retain the charges for a longer time is

The electrostatic force between two point charges is directly proportional to the

The number of electric lines that emerge from a finite charge $+q$ is

Assertion:- Electric field inside a metal surface is zero in electrostatic condition.
Reason:-Electric charges exist only on the surface of conductor.

Which is not the unit of electric field :

The force of interaction between two charges ${q_1} = 6\mu \;$ C and ${q_2} = 2\mu$ C is 12 N. If charge $q = - 2\mu$ C is added to each of the charges, then the new force of interaction is

One moving electron when comes closer to
other stationary electron, then its kinetic
energy and potential energy respectively _____
and _____

A point charge $+ q$ is placed at the midpoint of a cube of side $a$. The electric flux emerging from the cube is

When a negative charge is taken at a height from earth’s surface, then its potential energy

A charge $+ q$ is fixed to each of three corners of a square on the empty corner a charge $Q$ is placed such that there is no net electrostatic force acting is no net electrostatic force acting on the diagonally opposite charge. Then

A point charge is kept at the centre of a metallic insulated spherical shell. Then

The electric field intensity just sufficient to balance the earth's gravitational attraction on an electron will be: (given mass and charge of an electron respectively are $9.1 \times 10^{-31} \mathrm{~kg}$ and $1.6 \times 10^{-19} \mathrm{C}$.)

If two bodies are rubbed and one of them acquires $q_1$ charge and another acquires $q_2$ charge, then ratio $q_1 : q_2$ is

Suppose charge on a metallic sphere is $q.$ If the sphere
is put in contact with an identical uncharged sphere,
the charge will spread over the two spheres. By
symmetry charge on each sphere will be ……

When distance between two charged spheres is varied
so that it becomes half the initial distance, force
between them will become ……

The magnitude of electric force experienced by
a charged particle in an electric field depends
on:

Two equal point charges each of $3 \,\mu C$ are separated by a certain distance in metres. If they are located at $(\hat{i}+\hat{j}+\hat{k})$ and $(2 \hat{i}+3 \hat{j}+3 \hat{k}),$ then the electrostatic force between them is

A glass rod rubbed with silk is used to charge a gold leaf electroscope and the leaves are observed to diverge. The electroscope thus charged is exposed to $X$-rays for a short period. Then

There is an electric field $E$ in x-direction. If the work done in moving a change of 0.4 C through distance of 2 m along a line making an angle $60^\circ$ with x-axis is 12 J, then the value of electric field $E$ will be

Assertion (A): In a non-uniform electric field, a dipole will have translatory as well as rotatory motion.
Reason (R): In a non-uniform electric field, a dipole experiences a force as well as torque.

There are two charges $+ 1\;\mu C$ and $+ 5\mathrm{\;}\mu C$ respectively. The ratio of the forces acting on them will be

An electron of mass “M” kg and charge “e” coulomb travels from rest through a potential difference of “V” volt. The final velocity of electron is (in m/s)

Two small spheres each carrying a charge $q$ are placed $r$ metre apart. If one of the sphere is taken around the other one in a circular path of radius $r$, the work done will be equal to