List of top Physics Questions on Electric Field

A dipole is placed in an electric field as shown. In which direction will it move

Electric field due to infinite, straight uniformly charged wire varies with distance ‘r’ as

Match the following and select correct option:

Group-A		Group-B
(1)	DYNAMO rule	(A)	Gauss
(2)	Magnetic field	(B)	Fleming's right hand rule
(3)	Electro magnet	(C)	Weber
(4)	Magnetic flux	(D)	Microphone

Figure shows three points A, B and C in a region of uniform electric field \(\overrightarrow{E}\). The line AB is perpendicular and BC is parallel to the field lines. Then which of the following holds good? (V_A, V_B and V_C represent the electric potential at points A, B and C respectively)

An infinitely long thin straight wire has uniform charge density of $\frac {1}{4} \times 10^{-2} cm^{-1}.$ What is the magnitude of electric field at a distance $20\, cm$ from the axis of the wire ?

The electric field lines on the left have twice the separation on those on the right as shown in figure. If the magnitude of the field at $A$ is $40\,Vm^{-1}$, what is the force on $20\,\mu \,C$ charge kept at $B$?

Given the potential difference \( V(x) = -x^2 y \) volts, find the electric field at the point (1, 2).

Potential difference is given as V(x) = -x²y Volt. Find electric field at a point (1, 2) ?

Two point charges $q_1( \sqrt{10} \mu C)$ and $q_2(-25 \; \mu C)$ are placed on the x-axis at $x = 1 m$ and $x = 4 m$ respectively. The electric field (in V/m) at a point $y = 3 m$ on y-axis is, $\left[\text{take} \frac{1}{4\pi\varepsilon_{0}} = 9\times10^{9} Nm^{2} C^{-2}\right] $

Which one of the following graphs represents the variation of electric field with distance $r$ from the center of a charged spherical conductor of radius $R$?

Find the correct diagram of electric lines of forces for negative charge -

An electron falls from rest through a vertical distance h in a uniform and vertically upward directed electric field E. The direction of electric field is now reversed, keeping its magnitude the same. A proton is allowed to fall from rest in it through the same vertical distance h. The time of fall of the electron, in comparison to the time of fall of the proton is

A toy car with charge q moves on a frictionless horizontal plane surface under the influence of a uniform electric field \(\overrightarrow{E}\) . Due to the force q\(\overrightarrow{E}\), its velocity increases from 0 to 6 m/s in one second duration. At that instant the direction of the field is reversed. The car continues to move for two more seconds under the influence of this field. The average velocity and the average speed of the toy car between 0 to 3 seconds are respectively

An infinitely long thin non-conducting wire is parallel to the $z$-axis and carries a uniform line charge density $\lambda$. It pierces a thin non-conducting spherical shell of radius $R$ in such a way that the arc $PQ$ subtends an angle $120^{\circ}$ at the centre $O$ of the spherical shell, as shown in the figure. The permittivity of free space is $\in_0$. Which of the following statements is (are) true?

The magnitude of point charge due to which the electric field 30 cm away has the magnitude ,$2 \, NC^{-1}$ will be

A hollow insulated conduction sphere is given a positive charge of 10 $\mu$C. What will be the electric field at the centre of the sphere if its radius is 2 metres?

The electric intensities at a point due to two point charges in the $ x - y $ plane are $3 \hat{i} -2 \hat{j} $ and $ -2\hat{i} +4\hat{j} $ The magnitude of the resultant intensity at that point is

A proton and an electron are placed in a uniform electric field. Which of the following is correct?

A long string with a charge of a per unit length passes through an imaginary cube of edge L.
The maximum possible flux of electric field through the cube will be

The electric field strength in $N \,C\,^{-1}$ that is required to just prevent a water drop carrying a charge $1.6 \times 10^{-19} \, C$ from falling under gravity is $(g\, = \,9.8\, ms^{-2}$, mass of water drop = $0.0016\,g$)

A conducting sphere of radius R is given a onducting charge Q. The electric potential and the electric field at the centre of the sphere respectively are:

A, B and C are three points in a uniform electric field. The electric potential is

When a proton is released from rest in a room, it starts with an initial acceleration $a_0$ towards west. When it is projected towards north with a speed $v_0$ it moves with an initial acceleration 3$a_0$ toward west. The electric and magnetic fields in the room

A sphere of radius R has a volume density of charge $? = kr$, where r is the distance from the centre of the sphere and k is constant. The magnitude of the electric field which exists at the sur ace o the sphere is given by ($e_0$ = permittivity of the free space)

Two balls of same mass and carrying equal charge are hung from a fixed support of length $l$. At electrostatic equilibrium, assuming that angles made by each thread is small, the separation, $x$ between the balls is proportional to :