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CBSE XII
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Probability
A uniformly charged conducting sphere of diameter $2.4 \;m$ has a surface charge density of $80.0\;\mu C/m^2$ (i) Find the charge on the sphere (ii) what is the total electric flux leaving the surface of the sphere?
cbse
class12
physics
ch-1
sec-a
q51
easy
asked
Apr 24, 2015
by
meena.p
1
answer
A uniformly charged conducting sphere of diameter $2.4\;m$ has a surface charge density of $80.0\;\mu c/m^2$ (i) Find the charge on the sphere (ii) What is the total electric flux leaving the surface of the sphere ?
cbse
class12
physics
ch-1
sec-a
q51
easy
asked
Apr 24, 2015
by
meena.p
1
answer
This figure represents the electric lines of force at constant potentials, Shown in constant,Potentials, shown in bracket . At which point A , B and C is the electric field maximum ?
cbse
class12
physics
ch-1
sec-a
q50
difficult
asked
Apr 24, 2015
by
meena.p
1
answer
A cylinder of radius R and length L is placed in a uniform electric field parallel to the axis of a cylinder. What is the electric flux through the whole cylinder ?
cbse
class12
physics
ch-1
sec-a
q49
difficult
asked
Apr 24, 2015
by
meena.p
1
answer
If a point charge be rotated in an arc of radius r around a change q, what will be the workdone ? explain
cbse
class12
physics
ch-1
sec-a
q48
difficult
asked
Apr 24, 2015
by
meena.p
1
answer
If a point charge be rotated in an arc of radius r around a change q, what will be the workdone ? explain
cbse
class12
physics
ch-1
sec-a
q48
difficult
asked
Apr 24, 2015
by
meena.p
1
answer
A is a metallic sphere placed between two charged metallic plates. A student draws the line of force as shown in the figure . Is he correct ?
cbse
class12
physics
ch-1
sec-a
q47
difficult
asked
Apr 24, 2015
by
meena.p
1
answer
An electron and a proton are brought hearer. What will be the effect on potential energy of system ?
cbse
class12
physics
ch-1
sec-a
q46
medium
asked
Apr 24, 2015
by
meena.p
1
answer
Can electric field at a point be zero, while electric potential is not zero ?
cbse
class12
physics
ch-1
sec-a
q45
medium
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 .
cbse
class12
physics
ch-1
sec-a
q44
medium
asked
Apr 24, 2015
by
meena.p
1
answer
A proton and an electron are placed freely in an electric field. Which of the partides will have greater acceleration and why ?
cbse
class12
physics
ch-1
sec-a
q43
difficult
asked
Apr 24, 2015
by
meena.p
1
answer
A man in an insulted metallic cage does not receive a shock, even when the cage is connected to a high voltage source . Whay ?
cbse
class12
physics
ch-1
sec-a
q42
difficult
asked
Apr 24, 2015
by
meena.p
1
answer
Electrostatic experiments do not work during humid days . Explain
cbse
class12
physics
ch-1
sec-a
q41
medium
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?
cbse
class12
physics
ch-1
sec-a
q40
medium
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 ?
cbse
class12
physics
ch-1
sec-a
q39
medium
asked
Apr 24, 2015
by
meena.p
2
answers
Find equation of sphere passing through circle and touching a plane
math
coordinate-geometry
asked
Apr 23, 2015
by
rajesh.k
1
answer
Name the dielectric whose molecules have (i) non- zero and (ii) zero dipole moment.
cbse
class12
physics
ch-1
sec-a
q38
easy
asked
Apr 22, 2015
by
meena.p
1
answer
Why two electric lines of force cannot intersect each other ?
cbse
class12
physics
ch-1
sec-a
q37
medium
asked
Apr 22, 2015
by
meena.p
1
answer
Does the charge outside the guassian surface contribute to total electric flux ?
cbse
class12
physics
ch-1
sec-a
q36
easy
asked
Apr 22, 2015
by
meena.p
1
answer
What is the solid subtended by a hemisphere at a point inside it ?
cbse
class12
physics
ch-1
sec-a
q35
difficult
asked
Apr 22, 2015
by
meena.p
1
answer
An arbitrary surface encloses a dipole, What is the electric flux through this surface ?
cbse
class12
physics
ch-1
sec-a
q34
easy
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?
cbse
class12
physics
ch-1
sec-a
q33
medium
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?
cbse
class12
physics
ch-1
sec-a
q32
medium
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?
cbse
class12
physics
ch-1
sec-a
q32
medium
asked
Apr 22, 2015
by
meena.p
0
answers
What is the number of electric lines of force that radiate outward from one coulomb of change in vacuum ?
cbse
class12
physics
ch-1
sec-a
q31
easy
asked
Apr 22, 2015
by
meena.p
1
answer
An electric dipole moment $20 \times 10^{-6}\;C$ is enclosed by closed surface . what is net electric flux coming out of this surface ?
cbse
class12
physics
ch-1
sec-a
q30
medium
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 ?
cbse
class12
physics
ch-1
sec-a
q29
medium
asked
Apr 22, 2015
by
meena.p
1
answer
Quarles are building blocks of nucleus and posses fractional electronic charge. Does this discovers violate the principal of quantisation of charge ?
cbse
class12
physics
ch-1
sec-a
q28
difficult
asked
Apr 22, 2015
by
meena.p
1
answer
Electrostatic forces are much stronger than, gravitational force. Give one example.
cbse
class12
physics
ch-1
sec-a
q27
medium
asked
Apr 22, 2015
by
meena.p
1
answer
From the number of electrons in $lc$ of negative charge.
cbse
class12
physics
ch-1
sec-a
q26
difficult
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 ?
cbse
class12
physics
ch-1
sec-a
q25
medium
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 ?
cbse
class12
physics
ch-1
sec-a
q24
medium
asked
Apr 22, 2015
by
meena.p
1
answer
Draw electrostatic field lines for a positive charge Q.
cbse
class12
physics
ch-1
sec-a
q23
easy
asked
Apr 22, 2015
by
meena.p
1
answer
The force on an electron kept in an electric field in a particular direction is F. What will be the magnitude and direction of the force experienced by a proton kept at the same point in the filed ? Mass of the proton is about $1836$ times the mass of the electron
cbse
class12
physics
ch-1
sec-a
q22
difficult
asked
Apr 22, 2015
by
meena.p
2
answers
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
cbse
class12
physics
ch-1
sec-a
q21
medium
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 ?
cbse
class12
physics
ch-1
sec-a
q20
medium
asked
Apr 22, 2015
by
meena.p
1
answer
The electric field in a certain region of space is given by $E= \hat i +2 \hat j + 3\hat k Nc$. Calculate the electric flux over the area given by $S= 3 \hat i + 4 \hat j \;m^2$
cbse
class12
physics
ch-1
sec-a
q19
difficult
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 .
cbse
class12
physics
ch-1
sec-a
q18
medium
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 ?
cbse
class12
physics
ch-1
sec-a
q17
medium
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
cbse
class12
physics
ch-1
sec-a
q16
medium
asked
Apr 22, 2015
by
meena.p
1
answer
Two protons are brought nearer, What will be the effect on potential energy system ?
cbse
class12
physics
ch-1
sec-a
q15
medium
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 ?
cbse
class12
physics
ch-1
sec-a
q14
medium
asked
Apr 21, 2015
by
meena.p
1
answer
What is the change on $Cu^{++}$
cbse
class12
physics
ch-1
sec-a
q13
medium
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 ?
cbse
class12
physics
ch-1
sec-a
q12
medium
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 ?
cbse
class12
physics
ch-1
sec-a
q12
medium
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 ?
cbse
class12
physics
ch-1
sec-a
q11
medium
asked
Apr 21, 2015
by
meena.p
1
answer
An electrostatic field line cannot be discontinuous , why ?
cbse
class12
physics
ch-1
sec-a
q10
easy
asked
Apr 21, 2015
by
meena.p
1
answer
What is the angle between the direction of electric field at any (i) axial point and (ii) equatorial point. due to an electric dipole ?
cbse
class12
physics
ch-1
sec-a
q9
medium
asked
Apr 21, 2015
by
meena.p
1
answer
An electric dipole of dipole moment $20 \times 10^{-6}$ is enclosed by closed surface. what is the net flex coming out of this surface ?
cbse
class12
physics
ch-1
sec-a
q8
easy
asked
Apr 21, 2015
by
meena.p
1
answer
Consider the situation shown in the figure be what are the signs of $q_1$ and $q_2$ ?
cbse
class12
physics
ch-1
sec-a
q7
medium
asked
Apr 21, 2015
by
meena.p
1
answer
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