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Recent questions in Electric Charges and Fields

Questions >> JEEMAIN and NEET >> Physics >> Class12 >> Electric Charges and Fields

A charged particle of mass $\;m= 1 kg\;$ and charge $\;q=2\;\mu C\;$ is thrown from a horizontal ground at an angle $\;\theta=45^{0}\;$ with speed $\;20\;m/s\;.$ In space a horizontal electric field $E=2\times10^{6}\;V/m\;$ exist Find the range on horizontal ground of the projectile

asked Feb 4, 2014 by yamini.v

1 answer

The electric field in a region is given by $\;\overrightarrow{E}=\alpha\;x^2 \hat{i}\; $ Here $\;\alpha\;$ is a constant of proper dimensions . Find the total flux passing through a cube bounded by the surfaces . $x=l\;,x=2l\;,y=0\;,y=-l\;,z=0\;,z=l\;.$

asked Feb 4, 2014 by yamini.v

1 answer

Two identical balls having a mass m and small radii and having equal charge q are suspendended from common point by two insulating strings of equal length l . In equilibrium each string makes an angle $\;\theta\;$ with the vertical . If $\;\theta=45^{0}\;find\;l^2$ in terms of q and m

asked Feb 4, 2014 by yamini.v

1 answer

Four dipols each of magnitudes of charges $\;\pm q\;$ are placed inside a sphere . The total flux of $\overrightarrow{E}\;$ coming out of the sphere is

asked Feb 3, 2014 by yamini.v

1 answer

Three concentric conducting spherical shells carry charges +4Q on the inner shell , -2Q on the middle shell and +6Q on the outer shell . The charge on the inner surface of outer shell is

asked Feb 3, 2014 by yamini.v

1 answer

The electric field in a region is given by $\;\overrightarrow{E}=\alpha \hat{i}+\beta \hat{j}\;.$ Here $\;\alpha\; and \; \beta\;$ are constants . The net flux through a square are of side l parallel to y - z plane

asked Feb 3, 2014 by yamini.v

1 answer

ABC is an equilateral triangle of each side 5 cm . Two charges of $\;\pm\large\frac{50}{3}\times10^{-3}\;\mu C\;$ are placed at B and A respectively . Find the magnitude of resultant field at C .

asked Feb 3, 2014 by yamini.v

1 answer

Two point charges of 5C and 20C are separated by a distance of 6m . Find the point on the line joining them at which electric field intessity is zero .

asked Feb 3, 2014 by yamini.v

1 answer

If the electric flux entering and leaving an enclosed surface is $\phi_{1}\;and\;\phi_{2}\;.$ The charge inside the surface will be

asked Feb 3, 2014 by yamini.v

1 answer

A charge Q is placed at the corner of a cube electric flux through the cube is

asked Jan 30, 2014 by yamini.v

1 answer

An electric dipole of moment $\;\overrightarrow{P}\;$ is lying along a uniform electric field $\;\overrightarrow{E}\;$ The work done in relating the dipole by $\;90^{0}\;is$

asked Jan 30, 2014 by yamini.v

1 answer

Distribution of charges is shown in figure . The flux of electric field due to these charges through the surface is

asked Jan 30, 2014 by yamini.v

1 answer

An electron is moving round the nucleus of a hydrogen atom in a circular orbit of radius r . Find the coulomb force $\;\overrightarrow{F}\;$ between the two

asked Jan 30, 2014 by yamini.v

1 answer

A $\;Q \;\mu C\;$ is placed at the centre of a cube. The flux coming from any surface will be

asked Jan 30, 2014 by yamini.v

1 answer

If a charge q is placed at the centre of the line joining two equal charges Q such that the system is in equilibrium then the value of q is

asked Jan 30, 2014 by yamini.v

1 answer

Calculate the magnitude of an electric field which can just balance a deutron of mass $\;3.2\times10^{-27}\;kg$

asked Jan 30, 2014 by yamini.v

1 answer

The electric field in a region of space is $\;\overrightarrow{E}=5 \hat{i} +3 \hat {j}\;.$ The flux of $\;\overrightarrow{E}\;$ due to this field through an area $\;1 m^2\;$ lying in x - z plane is

asked Jan 30, 2014 by yamini.v

1 answer

Five point charges $\;(q\;each)\;$ are placed at five vertices of a regular hexagon of side 2a . What is the magnitude of net electric field at the centre of hexagon .

asked Jan 30, 2014 by yamini.v

1 answer

Charges 2 q and q are placed at $\;(a , 0)\;and\;(-a , 0)\;.$ The points where electric field is zero will lie in

asked Jan 30, 2014 by yamini.v

1 answer

A proton is released from rest , 10 cm from a charged sheet carrying charge density of $\;-2.21\times10^{-9}\;c/m^2\;.$ It will strike the sheet after time $\;(approximately)$

asked Jan 30, 2014 by yamini.v

1 answer

Two point charges $\;q_{1}=3\times10^{-6}\;C\;$ and $\;q_{2}=5\times10^{-6}\;C\;$ are located at $\;(3 , 5 ,1)\;$ and $\;(1 , 3 , 2)\;m$ . Find the force on $\;q_{1}\;$ due to $\;q_{2}\;.$

asked Jan 30, 2014 by yamini.v

1 answer

Find the force on points of a triangle

asked Jan 30, 2014 by yamini.v

1 answer

Consider the situation of figure the work done in moving to particles from P to A is $\;W_{A}\;is\;W_{B}\;$ and $\;P\;to\;C\;W_{C}\;$ Find the correct relation .

asked Jan 30, 2014 by yamini.v

1 answer

Two charge particles are placed at 1 m apart what is the minimum possible magnitude of electric force acting on each charge

asked Jan 29, 2014 by yamini.v

1 answer

Equal charges q are placed at x=0,2,4,8 m on x axis . Find the $\;|force|\;$ experienced by the charge at x=2 m

asked Jan 29, 2014 by yamini.v

1 answer

Two point charges $\;q_{1}\;and\;q_{2}\;$ are placed on $\;x=-a\;and\;x=+a\;respectively\;.$ Find the relation between $\;q_{1}\;and\;q_{2}\;$ so that the net electric field at $\;x=+\large\frac{a}{2}\;$ is zero

asked Jan 29, 2014 by yamini.v

1 answer

Find the direction of electric field at point P for the charge distribution as shown in figure

asked Jan 29, 2014 by yamini.v

1 answer

If a body is charged by rubbing it , its weight

asked Jan 29, 2014 by yamini.v

1 answer

A point charge q=12.5 $\mu $C is placed at origin . Find the electric field vector at the point $\;(4 , 3)$ .

asked Jan 29, 2014 by yamini.v

1 answer

Three point charges of each of charge q are placed on three vertices of a square of side "l" meter . Find the magnitude of electric field at the centre of the square .

asked Jan 29, 2014 by yamini.v

1 answer

Identify the correct statement about the charges $\;q_{1} \;and\; q_{2}$

asked Jan 29, 2014 by yamini.v

1 answer

At what separation should two equal charges 1.0 C be placed so that the force between then equals the weight of a 25 kg person ?

asked Jan 29, 2014 by yamini.v

1 answer

Units of electric flux are

asked Jan 29, 2014 by yamini.v

1 answer

What is the total charge on 75.0 kg of electrons ?

asked Jan 29, 2014 by yamini.v

1 answer

How many electrons must be removed from a piece of metal to give it a positive charge of $\;1\times10^{-7} \;C\;?$

asked Jan 29, 2014 by yamini.v

1 answer

Given electric field $ \overrightarrow {E} =[1 \times (d + x) \hat i +E_0 \hat j ] N/c$. If a closed surface as shown below is considered , find the change enclosed.

asked Jan 15, 2014 by meena.p

1 answer

Two point particles of same mass M are attached to two ends of a massless non-conducting rigid rod of length l. The charge on particle are +q and -q. The rod is held in a region of uniform electric field E making an angle $\theta $( very small) with E. The time t , after itself parallel to electric field after releasing it is :

asked Jan 15, 2014 by meena.p

1 answer

Two point particles of same mass M are attached to two ends of a massless non-conducting rigid rod of length l. The charge on particle are +q and -q. The rod is held in a region of uniform electric field E making an angle $\theta $( very small) with E. When rod is released , its angular frequency will be :

asked Jan 15, 2014 by meena.p

1 answer

Two point particles of same mass M are attached to two ends of a massless non-conducting rigid rod of length l. The charge on particle are +q and -q. The rod is held in a region of uniform electric field E making an angle $\theta $( very small) with E. Magnitude of torgue on rod will be equal to:

asked Jan 15, 2014 by meena.p

1 answer

Three infinite long plane sheets carrying charge densities $\sigma _1 =+3 \sigma , \sigma _2 =+2 \sigma $ and $\sigma _3 =- \sigma $ are placed parallel to $x-z$ plane at $y=4a,y=3a$ and $y=a $ respectively. Electric field at point P is :

asked Jan 15, 2014 by meena.p

1 answer

If electron of mass $m_e$ moves through a certain distance in a uniform electric field in time $t_1$ and proton of mass $m_p$ moves same distance in time $t_2$ , the ratio $\large\frac{t_1}{t_2}$ will be :

asked Jan 15, 2014 by meena.p

1 answer

Two thin rings of radius R are placed at a distance a between them such that their axes coincide. Potential difference between the centre of the ring will be , if charges on rings are $+q $ and $-q$

asked Jan 13, 2014 by meena.p

1 answer

A spherical shell of radius R has a charge Q uniformly distributed on its surface. What is the force exerted by one half over the other.

asked Jan 13, 2014 by meena.p

1 answer

Find electric field at point $(a,a,a) $ due to three infinitely long lines of charge density $\lambda$ along $x,y $ and $ z$ axis

asked Jan 13, 2014 by meena.p

1 answer

Three identical spheres , each having a charge q and radius R are kept in such a way that each touches the other two. Find magnitude of electric force on any sphere due to other two sphere,

asked Jan 13, 2014 by meena.p

1 answer

What will be the electric field at point P. Assume (r >> a)

asked Jan 13, 2014 by meena.p

1 answer

A parallel plate capacitor is immersed in liquid of dielectric constant K. Find force per unit area acting on plate from the liquid from dielectric in contact with the plate.

asked Jan 13, 2014 by meena.p

1 answer

A point charge Q is placed at the centre of an imaginary Gaussian surface. Find flux through curved surface.

asked Jan 13, 2014 by meena.p

1 answer

Electric field intensity due to a semi- infinite wire at a point A as shown is :

asked Jan 13, 2014 by meena.p

1 answer

A charged particle moves in a circle around an infinite line charge such that center of circle lies on line and line is perpendicular to plane of circle. If r is the radius of circle the velocity of particle will depend on which power of r .

asked Jan 10, 2014 by meena.p

1 answer

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