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Recent questions tagged electric-charges-and-fields

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

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

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

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If a body is charged by rubbing it , its weight

asked Jan 29, 2014 by yamini.v

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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. 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 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

A conducting spherical shell is earthed. A +ve charge $+q_1$ is placed at its centre and another +ve charge $+q_2$ is placed outside at a distance d from centre . If the conducting spherical shell is not earthed , then force on $q_2$ is:

asked Jan 10, 2014 by meena.p

1 answer

A conducting spherical shell is earthed. A +ve charge $+q_1$ is placed at its centre and another +ve charge $+q_2$ is placed outside at a distance d from centre . If the effect of induced charge due to $q_2$ on sphere is ignored. Then coulomb force on $q_2$

asked Jan 10, 2014 by meena.p

1 answer

A charge particle of mass 1 kg and charge $ 1 \mu c$ is projected from horizontal ground at an angle $ \theta=45^{\circ}$ with speed $10 ms^{-1}$. In space a horizontal electric field towards the direction of projection $E= 10^{7}NC^{-1}$ exists. The range of projectile is :

asked Jan 10, 2014 by meena.p

1 answer

A charge Q is placed at a distance $D( > R)$ above the centre of disk of radius R The magnitude of flux through disk is $\phi$ . Now a hemispherical shell of radius R is put above the disk to form a closed surface. The flux through the closed surface, if direction of area vector along outward normal is +ve, is :

asked Jan 10, 2014 by meena.p

1 answer

Two infinite long parallel wires having linear charge densities $\lambda_1\; and\; \lambda_2 $ respectively are placed at a distance R. The force per unit length on wire (1) will be:

asked Jan 10, 2014 by meena.p

1 answer

If a point charge is placed at the centre of closed cylindrical conductor of length l and radius R. the flux through the cylinder will be :

asked Jan 9, 2014 by meena.p

1 answer

A circular ring of radius R has charge Q distributed uniformly on it. If a space of radius R, has its centre lying on boundary of the ring, then flux coming out of sphere will be :

asked Jan 9, 2014 by meena.p

1 answer

An infinite long semicircular tube is given as shown below one half is given a surface charge density $+\sigma$ and other half is given charge density $-,\sigma $ . Electric field at a point on axis would be

asked Jan 9, 2014 by meena.p

1 answer

Mark the correct statements :

asked Jan 9, 2014 by meena.p

1 answer

The correct statement for the phenomenon of "Electrostatic Induction " is :

asked Jan 9, 2014 by meena.p

1 answer

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