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Published on: 23/08/2019
Electrostatics
Download CBSE Class 12th Standard CBSE Physics question papers, sample papers, important questions, and previous year solved papers in PDF format. Get free study materials, NCERT solutions, and exam preparation resources for Class 12th Standard CBSE Physics
Questions + Answers key
Take MCQ Physics Test
1.
Three charges Q, +9 and +9 are placed at the vertices of a right angle isosceles triangle as shown, Find the magnitude of Q for which net electrostatic energy of the configuration is zero.
2.
Charge of 2C is placed at the centre of a cube volume 8 cm3. What is the electric flux passiing through one face?
3.
Each of the uncharged capacitor in the fig.Has a capacitance of 25\(\mu \)F. what charge shall flow through the meter M when the switch S is Closed?
4.
Device an arrangemnet of three point charges separated by finite distances that has zero electric potential energy.
5.
Name any two basic properties of electric charge.
6.
A glass rod rubbed with silk acquires a charge +1.6 x 10-12 C. What is the charge on the silk?
7.
Why does an ebonite rod get negatively charged on rubbing with fur?
8.
Is the total charge of the universe conserved?
9.
What do you mean by conservation of electric charge?
10.
What do you mean by additivity of electric charge?
11.
What is meant by quantization of charge?
12.
An ebonite rod is rubbed with fur or wool. What type of charges do they acquire?
13.
An isolated conducting sphere is given a positive charge. Does its mass increase, decrease or remain the same?
14.
What is the cause of charging?
15.
Consider a region inside which there are various types of charges but the total charge is zero. At points outside the region
the electric field is necessarily zero
the electric field is due to the dipole moment of the charge distribution only
the dominant electric field is \(\alpha {1\over r^3}\) , for large r , where r is the distance from a origin in this region.
the work done to move a charged particle along a closed path, away from the region, will be zero.
16.
If there were only one type of charge in the universe, then
\(\oint _{ s }^{ }{ \overrightarrow { E } .\overrightarrow { ds } } \neq 0\) on any surface
\(\oint _{ s }^{ }{ \overrightarrow { E } .\overrightarrow { ds } } = 0\) if the charge is outside the surface
\(\oint _{ s }^{ }{ \overrightarrow { E } .\overrightarrow { ds } } \) could not be defined
\(\oint _{ s }^{ }{ \overrightarrow { E } .\overrightarrow { ds } } ={q\over \epsilon_o}\) if charges of magnitude q were inside the surface
17.
The electric field at a point is
always continuous
continuous if there is no charge at that point
discontinuous only if there is a negative charge at that point
discontinuous if there is a charge at that point
18.
The number of electric lines of force radiating from a closed surface in vacuum is \(1.13\times 10^{11}\). The charge enclosed by the surface is
1 C
\(1\mu C\)
0.1 C
0.1\(\mu C\)
19.
A closed surface in vacuum encloses charges -q and +3q. Another charge -2q lies outside the surface. Total electric flux over the surface is
Zero
\(2 q\over \epsilon_o\)
\(-{3q\over \epsilon_o}\)
\(4q\over\epsilon_o\)
20.
Work done in carrying an electron from A to B lying on an equipotential surface of one volt potential is
1 eV
10 eV
1 volt
Zero
21.
Electrostatic potential V at a point, distant r from a charge q varies as
q/r2
q2/r
q/r
q2/r2
22.
Electric field due to an electric dipole is
spherically symmetric
cylindrically symmetric
asymmetric
none of the above
23.
The SI unit of electric field intensity is
N
N/C
C/m2
N/m2
24.
At a particular point, electric field depends upon
Source charge Q only
test charge qo only
both Q and q0
neither Q nor qo
1.
\(\mathrm{U}=\mathrm{K}\left(\mathrm{q}^2 / \mathrm{a}+\mathrm{qQ} / \mathrm{a}+\mathrm{qQ} / 2 \mathrm{a}\right)\)
But U = 0
Therefore \(Q-2 q /(2+\sqrt{2})\)
2.
\(\text { Toral } \phi=\mathrm{q} 0 / \varepsilon_0=2 / \varepsilon_0, \rightarrow \text { flux through one face }=\phi / 6=1 / 3 \varepsilon_0\)
3.
\(C=C+C+C=3 C=75 \mu \mathrm{H}\)
Therefore m charge = \(75 \mu \mathrm{F} \times 4200 \mathrm{~V}=315 \mathrm{mC} .\)
4.
U = kq2/a - kq2/2a - kq2/2a = 0
5.
(i) Quantization of charge
(ii) Conservation of charge
6.
Charge on silk is equal and opposite to charge on glass rod. i.e., q = 1.6 x 10-12 C
7.
This is because electron in fur are less tightly bound than electrons in ebonite rod.
8.
Yes, charge conservation is a global phenomenon.
9.
Conservation of electric charge means that the total charge on an isolated system remains unchanged with time.
10.
Additivity of charge means the total charge on a system is the algebraic sum (with proper signs) of all individual charges in the system.
11.
Charge on any body or particle can be integral multiple of charge on an electron (-e), i.e.,
q = \(\pm ne\), where n = 1, 2, 3,....
12.
The ebonite rod acquires a negative charge and fur/ wool acquires an equal positive charge.
13.
Its mass decreases slightly as it losses some electrons.
14.
The cause of charging is actual transfer of electrons from one body to the other.
15.
(c)
the dominant electric field is \(\alpha {1\over r^3}\) , for large r , where r is the distance from a origin in this region.
16.
(b)
\(\oint _{ s }^{ }{ \overrightarrow { E } .\overrightarrow { ds } } = 0\) if the charge is outside the surface
17.
(b)
continuous if there is no charge at that point
18.
(a)
1 C
19.
(b)
\(2 q\over \epsilon_o\)
20.
(d)
Zero
21.
(c)
q/r
22.
(b)
cylindrically symmetric
23.
(b)
N/C
24.
(a)
Source charge Q only
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