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CBSE - XII Science - Physics - Electric Charges and Fields
Deduce Coulomb's law from Gauss theorum.
Asked by Aarushi Srivastava
11th May 2022,
8:19 PM
CBSE - XII Science - Physics - Electric Charges and Fields
gauss theorem
Asked by rajwindersarao111
21st July 2020,
8:50 AM
CBSE - XII Science - Physics - Electric Charges and Fields
what is guss ,law
Asked by sarojinib726
29th June 2020,
7:57 AM
CBSE - XII Science - Physics - Electric Charges and Fields
why is the electric field inside a hollow sphere is zero? eventhough we consider gaussian surface where Q=0 won`t the charge on the surface of hollow sphere cause electric field inside hollow sphere? why??
Asked by my3shyll
17th May 2018,
8:00 AM
CBSE - XII Science - Physics - Electric Charges and Fields
Why does the charge inside the closed surface of a gaussian surface contribute to electric flux. Why doesnt it pass through as in the case of electric flux due to a charge that is situated outside?
Ans: When we find electric flux through a surface, then we consider the charge enclosed by the surface. This is done because Gauss' law is defined in terms of charge enclosed. So, a charge that is situated inside the surface contributes to the flux.
Thank you for a quick response. However, the answer provided by you doesnt clarify my doubt. There was a clear reasoning provided in the video lesson, why charge outside does not contribute to the flux. The electric field lines produced by a charge situated outside pass through the gaussian surface. Therefore, the question iam asking is that, what happens in the case of charge situated inside.
Why does the charge inside the closed surface of a gaussian surface contribute to electric flux. Why doesnt it pass through as in the case of electric flux due to a charge that is situated outside?
Ans: When we find electric flux through a surface, then we consider the charge enclosed by the surface. This is done because Gauss' law is defined in terms of charge enclosed. So, a charge that is situated inside the surface contributes to the flux.
Asked by Anirudh
10th August 2017,
12:30 PM
CBSE - XII Science - Physics - Electric Charges and Fields
Why does the charge inside the closed surface of a gaussian surface contribute to electric flux. Why doesnt it pass through as in the case of electric flux due to a charge that is situated outside?
Asked by Anirudh
8th August 2017,
3:20 PM
CBSE - XII Science - Physics - Electric Charges and Fields
Kindly explain the following question why is the angle subtracted ? Please do so by using a diagram.
Asked by Varsneya Srinivas
14th April 2017,
10:16 AM
CBSE - XII Science - Physics - Electric Charges and Fields
The radius of a gold nucleus (Z=79) about 7*10^-15m.Assume that thre positively charge is distributed uniformly throught the nuclear volume.Find ther electric field at thr middle of radius .
Asked by Balbir
13th April 2017,
10:35 PM
CBSE - XII Science - Physics - Electric Charges and Fields
A charge Q is uniformly distributed over a rod of length l.Consider a hypothetical cube of edge L with the centre of the cube at one end of the rod.Find th minimum possible flux of the electric field through the entire surface of the cube.
Asked by Balbir
8th April 2017,
2:46 PM
CBSE - XII Science - Physics - Electric Charges and Fields
Why field inside a unifomly charged thin spherical is zero?
Asked by Sudesh
15th September 2016,
4:14 PM
CBSE - XII Science - Physics - Electric Charges and Fields
in question 28 ncert i just want to know the meaning with proper draw and why in what actaully gauss law is
Asked by saggugurupal
30th May 2016,
12:50 PM
CBSE - XII Science - Physics - Electric Charges and Fields
Pls provide the soln for this sir?? 
Asked by ayushi
26th April 2016,
6:25 PM
CBSE - XII Science - Physics - Electric Charges and Fields
a long line charge of charge density 
/cm produces an electric field of 
at a distance r from the line charge> the value of r must be??
/cm produces an electric field of at a distance r from the line charge> the value of r must be??
Asked by ayushi
24th April 2016,
8:55 AM
CBSE - XII Science - Physics - Electric Charges and Fields
How centre of gravity cancels all torques due to mg on a body?
Asked by dkp_ankit
12th December 2015,
3:36 PM
CBSE - XII Science - Physics - Electric Charges and Fields
Define electric flux. Write its S.I unit. State and explain Gauss’s law. Find out the outward flux to a point charge +q placed at the centre of a cube of side ‘a’. Why is it found to be independent of the size and shape of the surface enclosing it? Explain.
Asked by Topperlearning User
10th July 2015,
10:06 AM
CBSE - XII Science - Physics - Electric Charges and Fields
A charge Q is placed at the centre of an uncharged hollow metallic sphere of radius a.(a) Find the surface charge density on the inner surface and on the outer surface.(b)If a charge q is put on the sphere,what would be the surface charge density on the inner and the outer surface?(c)Find the electric field inside the sphere at a distance x from the centre in the sitution (a) and (b).
Asked by Amrit
29th April 2015,
9:52 AM
CBSE - XII Science - Physics - Electric Charges and Fields
(a) Using Gauss' law, derive an expression for the electric field intensity at any point outside a uniformly charged thin spherical shell of radius R and charge density σ C/m². Draw the field lines when the charge density of the sphere is (I) positive, (ii) negative. (b) A uniformly charged conducting sphere of 2.5 m in diameter has a surface charge density of 100 μC/m2. Calculate the (i) Charge on the sphere (ii) Total electric flux passing through the sphere. Or (a) Derive an expression or the torque experienced by an electric dipole kept in a uniform electric field. (b) Calculate the work done to dissociate the system of three charges placed on the vertices of a triangle as shown. Here, q = 1.6 x 10-10 C
Asked by Topperlearning User
17th April 2015,
2:14 PM
CBSE - XII Science - Physics - Electric Charges and Fields
What is electric flux? Write its S. I. Units. Using Gauss's theorem, deduce an expression for the electric field at a point due to a uniformly charged infinite plane sheet.
Asked by Topperlearning User
17th April 2015,
2:04 PM
CBSE - XII Science - Physics - Electric Charges and Fields
Using Gauss's law obtain the expression for the electric field due to a uniformly charged thin spherical shell of radius R a point outside the shell. Draw a graph showing the variation of electric field with r, for r > R and r < R.
Asked by Topperlearning User
17th April 2015,
2:01 PM
CBSE - XII Science - Physics - Electric Charges and Fields
Figure shows three point charges,+2q,-q and+3q.Two charges+2q and- q are enclosed within a surface 'S'.What is the electric flux due to this configuration through the surface'S'?
Asked by Topperlearning User
17th April 2015,
2:00 PM
CBSE - XII Science - Physics - Electric Charges and Fields
Derive the expression for electric field intensity due to a uniformly charged thin spherical shell.
Asked by Topperlearning User
16th April 2015,
1:16 PM
CBSE - XII Science - Physics - Electric Charges and Fields
Find out electric field intensity due to a uniformly charged infinite plane sheet?
Asked by Topperlearning User
16th April 2015,
12:56 PM
CBSE - XII Science - Physics - Electric Charges and Fields
Using Gauss law find out electric field intensity due to a line charge.
Asked by Topperlearning User
16th April 2015,
12:49 PM
CBSE - XII Science - Physics - Electric Charges and Fields
Prove that total electric flux over the closed surface S in vacuum is 1/ε0 times the total charge (Q) contained inside S.
Asked by Topperlearning User
16th April 2015,
12:41 PM
CBSE - XII Science - Physics - Electric Charges and Fields
The electric field in a region is radially outward with magnitude E = Ar. Find the charge contained in a sphere of radius r = 10 cm and A = 100 V/m2
Asked by Topperlearning User
16th April 2015,
11:11 AM
CBSE - XII Science - Physics - Electric Charges and Fields
A hollow conducting sphere of radius 10 cm is given a charge of 20 μC. What is the electric field intensity? a. At the centre of the sphere, and b. On the outer surface of the sphere?
Asked by Topperlearning User
16th April 2015,
11:09 AM
CBSE - XII Science - Physics - Electric Charges and Fields
Prove that no electric field exists inside a hollow charged sphere.
Asked by Topperlearning User
16th April 2015,
11:06 AM
CBSE - XII Science - Physics - Electric Charges and Fields
State Gauss's law in electrostatics.
Asked by Topperlearning User
16th April 2015,
11:06 AM
CBSE - XII Science - Physics - Electric Charges and Fields
Define electric flux. When will the flux is said to be positive and negative?
Asked by Topperlearning User
16th April 2015,
10:52 AM
CBSE - XII Science - Physics - Electric Charges and Fields
What is the direction of electric field at a point near a thin infinite plane sheet of charge?
Asked by Topperlearning User
16th April 2015,
10:47 AM
CBSE - XII Science - Physics - Electric Charges and Fields
Draw a graph showing variation of electric field intensity E with distance from the centre of a uniformly charged spherical shell.
Asked by Topperlearning User
16th April 2015,
10:46 AM
CBSE - XII Science - Physics - Electric Charges and Fields
Why does the person sitting in a car is saved from atmospheric lightning?
Asked by Topperlearning User
16th April 2015,
10:42 AM
CBSE - XII Science - Physics - Electric Charges and Fields
What will be the Gauss's law statement if a medium of dielectric constant K is present?
Asked by Topperlearning User
16th April 2015,
10:42 AM
CBSE - XII Science - Physics - Electric Charges and Fields
What do you mean by Gaussian surface?
Asked by Topperlearning User
16th April 2015,
10:41 AM
CBSE - XII Science - Physics - Electric Charges and Fields
Explain the principle of a device that can build up high voltages of the order of few million volts. Draw a schematic diagram and explain the working of this device. Is there any restriction the upper limit of the high voltages set up in this machine? Explain. OR (a) Define electric flux. Write its S.I units. (b) Using Gauss's law prove that electric field at a point due to a uniformly charged infinite plane sheet is independent of the distance from it. (c) How is the field directed if (i) the sheet is positively charged, (ii) negatively charged ?
Asked by Topperlearning User
16th April 2015,
8:31 AM
CBSE - XII Science - Physics - Electric Charges and Fields
Q.Why gauss law is valid only when coulombs law obeys inverse square law?
Asked by Ravi consul
4th March 2015,
6:25 PM
CBSE - XII Science - Physics - Electric Charges and Fields
show a graph of electic field versus distance (from the centre) for a long charged rod having linear charge density (lambda < 0)
Asked by MAANASI.M
8th June 2014,
9:37 PM
