Recent questions tagged medium

An arbitrary surface enclosed a dipole . what is the electric flux through this surface ?

asked Apr 29, 2015 by meena.p

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Suppose the particle in $Q_{33}$ is an electron projected with velocity $V_x =2.0 \times 10^6 m/s$. If E between the plates separated by $0.5 \;cm$ is $9.1 \times 10^2 N/C$, where will the electron strike the upper plate ? $(|e|=1.6 \times 10^{-19}\;C,m_e=9.1 \times 10^{-3}\;kg)$

asked Apr 29, 2015 by meena.p

1 answer

A particular of mass m and charge $(-q)$ enters the region between the two charged plates initially moving along x-axis with speed $V_x $ (like particle 1 in the figure) . The length of plate of L and a uniform electricity field E is maintained between the plates. she that the vertical deflection of the particle at the fan edge of the plate is 4qEl^2/2mv_x ^2$. Compare this motion with motion of a projectile in gravitational field.

asked Apr 29, 2015 by meena.p

1 answer

Verify this result for the simple configuration of two charge of the same magnitude and sign placed at a certain distance apart.

asked Apr 29, 2015 by meena.p

1 answer

Consider an arbitrary electrostatic field configuration . A small test charge is placed at a null point . ( i.e where $E=0$)of the configuration . Show that the equilibrium of the test charge is necessarily unstable .

asked Apr 29, 2015 by meena.p

1 answer

A hollow charged conductor has a tiny hole cut into its surface . show that the electric field in the hole is $ \bigg( \large\frac{\sigma}{2 \in_0}\bigg)$$\hat n$, where $\hat n$ is the unit vector in the outward normal direction and $\sigma$ is the surface change density near the hole.

asked Apr 28, 2015 by meena.p

1 answer

A sensitive instrument is to shielded from the story electrostatic field in its environment . Suggest a possible way

asked Apr 28, 2015 by meena.p

1 answer

Another conductor B with charge q is inserted into the cavity keeping B insulted from A. Show that the total charge on the outside surface of A is $Q+q$ (fig b)

asked Apr 28, 2015 by meena.p

1 answer

A conductor A with a cavity as shown in the fig(a) is given a charge Q. Show that the entire charge must appear on the outer surface of the conductor .

asked Apr 28, 2015 by meena.p

1 answer

In a certain region of space , electric field is along the z- direction throughout. The magnitude of electric field is, however not constant but increases uniformly along the positive z- direction, at the rate of $10^5 N/c-m$. What are the force and torque experienced by a system having a total dipole moment equal to $10^{-7}c-m$ in the negative z- direction ?

asked Apr 28, 2015 by meena.p

1 answer

As oil drop of 12 excess electron is held stationary under a constant electric field of $2.55 \times 10^4 \;N/C$ in Millikan's oil drop experiment . The density of the oil is $ 1.26\;g/cm^3$ Estimate the radius of the drop . $(g = 9.8 \;m/s^2; e = 1.60 \times 10^{-91}\;C)$

asked Apr 28, 2015 by meena.p

1 answer

Two point charges $+9e$ and $e$ are seperated by 412\;cm4 in air. determine the position of the point at which the resultant electric is zero.

asked Apr 28, 2015 by meena.p

1 answer

A conductor with a cavity in it is given a charge Q. What will be the total charge on the surface of this conductor if another carrying charge q is placed in the cavity without touching the cavity ?

asked Apr 28, 2015 by meena.p

1 answer

An infinite line charge produces a field of $ 9 \times 10^4 \;N/c$ at a distance of $2 \;cm$ . calculate the linear density .

asked Apr 28, 2015 by meena.p

1 answer

A uniformly charged conducting sphere of $2.4\;m$ diameter has a surface charge density of $80.0 \mu c/m^2$ a) find the charge on the sphere b) what is the total electric flux leaving the surface of the sphere ?

asked Apr 28, 2015 by meena.p

1 answer

A point charge causes an electric flux of $-1.0 \times 10^{3} Nm^2/C$. to pass through a spherical gaussian surface of $10.0\;cm$ radius centred on the charge . What is the value of the point charge ?

asked Apr 28, 2015 by meena.p

1 answer

A point charge causes an electric flux of $-1.0 \times 10^{3} Nm^2/C$. to pass through a spherical gaussian surface of $10.0\;cm$ radius centred on the charge .If the radius of the gauassian surface were doubled, how much flux would pass through the surface ?

asked Apr 28, 2015 by meena.p

1 answer

A point charge of $2.0 \mu C$ is at the centre of a cubic guassian surface $9.0\;cm $ on edge. What is the net electric flux through the surface ?

asked Apr 27, 2015 by meena.p

1 answer

A point charge $+10 \mu c$ is at a distance $5\;cm$ directly above the center of a square of side $10\;cm$ , as shown in fig. What is the magnitude of the electric flux through the square . (Hint : Think of the square as one face of a cube with edge 10 cm)

asked Apr 27, 2015 by meena.p

1 answer

Careful measurement of the electric field at the surface of a block box indicates that the net outward flux through the surface of the box is $8.0 \times 10^3 \;N-m^2 /C$.If the net outward flux through the surface of the box were zero, could you conclude that there were no changes inside the $60 x?$ Why or why not ?

asked Apr 27, 2015 by meena.p

1 answer

Careful measurement of the electric field at the surface of a block box indicates that the net outward flux through the surface of the box is $8.0 \times 10^3 \;N-m^2 /C$. What is the net change inside the box ?

asked Apr 27, 2015 by meena.p

1 answer

Consider a uniform electric field $E=3 \times 10 \times 10^3 \hat i N/C$. What is the flase through the same square if the normal to its plane makes an angle of $60^{\circ}$ with the x- axis ?

asked Apr 27, 2015 by meena.p

1 answer

Consider a uniform electric field $E=3 \times 10 \times 10^3 \hat i N/C$. What is the flux of this foeld through a square of $10 \;cm$ a side whose plane is parallel to the y-z plane ?

asked Apr 27, 2015 by meena.p

1 answer

A system has two changes $q_A= 2.5 \times 10^{-7} C$and $q_B= -2.5 \times 10^{-7}\;C$ located at points $A( 0,0)\;-15 \;cm$ and $B(0,0,+15\;cm)$ and $B( 0,0,+15\;cm)$ respectively. What are the total change and electric dipole moment of the system ?

asked Apr 27, 2015 by meena.p

1 answer

An electron and a proton are brought hearer. What will be the effect on potential energy of system ?

asked Apr 24, 2015 by meena.p

1 answer

Can electric field at a point be zero, while electric potential is not zero ?

asked Apr 24, 2015 by meena.p

1 answer

Is electric flux a scalar or a vector quantity ? Write electric flux as a scalar product of two vectors .

asked Apr 24, 2015 by meena.p

1 answer

Electrostatic experiments do not work during humid days . Explain

asked Apr 24, 2015 by meena.p

1 answer

You are given three uncharged spherical conductors A,B, and C touching each other . A glass rod carrying positive charge is brought near sphere A as shown. What will be the charges on spheres A,B and C?

asked Apr 24, 2015 by meena.p

1 answer

A metallic sphere is placed in a uniform electric field as shown in the figure. which path is folllowed by electric field lines? why ?

asked Apr 24, 2015 by meena.p

2 answers

Why two electric lines of force cannot intersect each other ?

asked Apr 22, 2015 by meena.p

1 answer

What is the net flux of the uniform electric field through a cube of side $20\;cm$ oriented so that its faces are parallel to the coordinate planes?

asked Apr 22, 2015 by meena.p

1 answer

Figure shows three point changes $+2q,-q,+3q$ Two changes $+2q$ and $-q$ are enclosed with a surface S. What is the electric flux due to this configuration through the surface S?

asked Apr 22, 2015 by meena.p

1 answer

Figure shows three point changes $+2q,-q,+3q$ Two changes $+2q$ and $-q$ are enclosed with a surface S. What is the electric flux due to this configuration through the surface S?

asked Apr 22, 2015 by meena.p

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An electric dipole moment $20 \times 10^{-6}\;C$ is enclosed by closed surface . what is net electric flux coming out of this surface ?

asked Apr 22, 2015 by meena.p

1 answer

An ebonite red held in hand can be charged by rubbing with flannel , but a copper rod cannot be changed like this way ?

asked Apr 22, 2015 by meena.p

1 answer

Electrostatic forces are much stronger than, gravitational force. Give one example.

asked Apr 22, 2015 by meena.p

1 answer

Consider three charged bodies A,B and C. If A and repel each and A attracts C, What is the nature of force between B and C ?

asked Apr 22, 2015 by meena.p

1 answer

A change q is placed at the center of a cube of side l. What is the electric flux passing through each face of the cube ?

asked Apr 22, 2015 by meena.p

1 answer

A dipole moment P is kept in a uniform electric field E. Write the value of the angle between P and E for which the torque experienced by the dipole is (i) minimum (ii) maximum

asked Apr 22, 2015 by meena.p

1 answer

Can electrostatic potential at a point , be zero, while electric field at that point is not zero ?

asked Apr 22, 2015 by meena.p

1 answer

The net inward flux through any closed surface is $8.0 \times 10^3Nm^2 c^{-1} $. Find the net charge inside the box .

asked Apr 22, 2015 by meena.p

1 answer

In which orientation , a dipole placed in a uniform electric field is in (i) stable (ii) unstable equilibrium ?

asked Apr 22, 2015 by meena.p

1 answer

Two dipoles , made from charge $\pm q$ and $\pm Q$ respectively , have equal dipole moments . give the (i) ratio between the seperation of these two pairs of charges. (ii) angle between the dipole axis of these two dipoles

asked Apr 22, 2015 by meena.p

1 answer

Two protons are brought nearer, What will be the effect on potential energy system ?

asked Apr 21, 2015 by meena.p

1 answer

A man in an insulated metallic cage does not receive a shock , even when the cage connected to a high voltage source. why ?

asked Apr 21, 2015 by meena.p

1 answer

What is the change on $Cu^{++}$

asked Apr 21, 2015 by meena.p

1 answer

The distance of the field point, on the equatorial place of a small electric dipole is halved . By what factor does the electric field due to the dipole charge ?

asked Apr 21, 2015 by meena.p

0 answers

The distance of the field point, on the equatorial place of a small electric dipole is halved . By what factor does the electric field due to the dipole charge ?

asked Apr 21, 2015 by meena.p

1 answer

A and B are two conducing spheres of the same radius, A being solid and B hollow. Both are changed to the same potential . What will be the relation between the changes on the two spheres ?

asked Apr 21, 2015 by meena.p

1 answer

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