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Published on: 05/11/2019
Electrostatics
Download Tamil Nadu 12th Standard Physics question papers, model tests, one-mark questions, important questions, and public exam papers in PDF format. Free study materials and answer keys for TN State Board students.
Questions + Answers key
Take MCQ Physics Test1.
When an electric dipole of dipole moment p is aligned parallel to the electric field E then the potential energy of the dipole is given as _________.
pE
zero
-pE
\(\frac{pE}{\sqrt{2}}\)
2.
Two point charges +q and -q are placed at points A and B respectively separated by a small distance. The electric field intensity at the midpoint O of AB :
is zero
acts along AB
acts along BA
acts perpendicular to AB
3.
The unit of electric field intensity is _______.
NC-1
NC-1C2m-1
Cm
Volt-meter
4.
A closed system contains four charges -8.1C, 14.6C, 20.2C and -200 mC. The total charge in the system_______.
26.5 C
-173.3 C
43.1 C
243.9 C
5.
When a point charge of 6mC is moved between two points in an electric field, the work done is 1.8 x 10-5 J. The potential difference between the two points is
1.08 V
1.08 μV
3 V
30 V
6.
Which instrument was used to demonstrate the electrostatic shielding?
Lightning arrester
Van de graaff generator
Faraday cage
Gold leaf electroscope
7.
A charge q1 exerts force on charge q2. If another charge q3 is brought near, the force of q1, exerted on q2, will be
decreased
increased
remains unchanged
increased if q3 is of same sign as q1 and decreased if q2 is of opposite sign.
8.
A charge q is enclosed as shown in fig. The electric flux is
maximum in (i)
maximum in (ii)
maximum in (iii)
equal in all
9.
A condenser of 2μF capacitance is charged steadily from 0 to 5 coulomb. Which of the following graphs correctly represents the variation of potential difference across its plates with respect to the charge on the condensor [Q = C V ]
10.
During charging a capacitor variation of potential V of the capacitor with time t as shown a
11.
What physical quantities may X and Y represent? [Y represents the first mentioned quantity].
K.E - velocity of a particle
pressure - temperature of a given gas (constant volume)
capacitance - charge to give a constant potential
potential - capacitance to give a constant charge
12.
A charge Q is placed at the corner of a cube. The electric flux through all the six faces of the cube is
\(\frac { Q }{ { 3\varepsilon }_{ 0 } } \)
\(\frac { Q }{ { 6\varepsilon }_{ 0 } } \)
\(\frac { Q }{ { 8\varepsilon }_{ 0 } } \)
\(\frac { Q }{ { \varepsilon }_{ 0 } } \)
13.
The electric flux through a surface will be minimum when the angle between E and A is
90°
60°
0°
45°
14.
Which of the following cannot be the units of electric field intensity?
NC-1
Vm-1
JC-1/m
JC-1
15.
Region around a charge q in which it exerts force on a test charge is called
electric flux intensity
electric force
electric field
Coulomb's force
16.
The capacitance of a parallel plate capacitor increases from 5μf of 50μf when a dielectric is filled between the plates. The permitivity of the dielectric is
8.854 x 10-12 C2N-1 m-2
8.854 x 10-11C2N-1 m-2
10 x 10-12C2N-1 m-2
12 x 10-12C2N-1 m-2
17.
In tuning radio we use,
capacitors
transistors
diodes
LEDS
18.
Two charges are kept at a distance in air what should be the relative permittivity of the medium in which the two charges should be kept at the same distance so that they experience half of the force which they experienced in air?
\(\frac{1}{2}\)
\(\frac{1}{0.2}\)
2
0.2
19.
The lower comb of van de graaff generator is maintained at a positive potential of
10 kV
107 V
100 V
103 V
20.
The direction of electric field at a point the equatorial line due to an electric dipole is
along the equatorial line towards the dipole.
along the equatorial line away from the dipole
parallel to the axis of the dipole and opposite to the direction of dipole moment
parallel to the axis of the dipole and in the direction of dipole moment.
21.
In the given cricuit the effective capacitance between A and B will be
3μf
\(\frac{36}{13}\) μf
13μf
7μf
22.
The electric flux is negative, if the angle between \(\overset { \rightarrow }{ dA } \) and \(\overset { \rightarrow }{ E } \) is
Less than 90°
greater than 90°
equal to 90°
equal to 0°
23.
The expression for the electric field due to a surface of total charge 'Q' is given by __________
\(\overset { \rightarrow }{ E } =\frac { 1 }{ 4\pi { \varepsilon }_{ 0 } } \int { \frac { \sigma dA }{ { r }^{ 2 } } } \hat { r } \)
\(\overset { \rightarrow }{ E } =\frac { 1 }{ 4\pi { \varepsilon }_{ 0 } } \int { \frac { \rho dA }{ { r }^{ 2 } } } \hat { r } \)
\(\overset { \rightarrow }{ E } =\frac { 1 }{ 4\pi { \varepsilon }_{ 0 } } \int { \frac { \lambda dl }{ { r }^{ 2 } } } \hat { r } \)
\(\overset { \rightarrow }{ E } =\frac { 1 }{ 4\pi { \varepsilon }_{ 0 } } \int { \frac { dq }{ { r }^{ 2 } } } \hat { r } \)
24.
Charge per unit volume is called _____________
Linear charge density (λ)
Surface charge density (σ)
Volume charge density (ρ)
Electric flux
25.
An isolated metal sphere of radius 'r' is given a charge' q'. The potential energy of the sphere is ____________
\(\frac { { q }^{ 2 } }{ 4\pi { \varepsilon }_{ 0 }r } \)
\(\frac { { q }^{ } }{ 4\pi { \varepsilon }_{ 0 }r } \)
\(\frac { { q }^{ } }{ 8\pi { \varepsilon }_{ 0 }r } \)
\(\frac { { q }^{ 2 } }{ 8\pi { \varepsilon }_{ 0 }r } \)
1.
(c)
-pE
2.
(b)
acts along AB
3.
(a)
NC-1
4.
(a)
26.5 C
5.
(c)
3 V
6.
(c)
Faraday cage
7.
(c)
remains unchanged
8.
(d)
equal in all
9.
(a)
10.
(a)
11.
(d)
potential - capacitance to give a constant charge
12.
(d)
\(\frac { Q }{ { \varepsilon }_{ 0 } } \)
13.
(a)
90°
14.
(d)
JC-1
15.
(c)
electric field
16.
(b)
8.854 x 10-11C2N-1 m-2
17.
(a)
capacitors
18.
(b)
\(\frac{1}{0.2}\)
19.
(a)
10 kV
20.
(c)
parallel to the axis of the dipole and opposite to the direction of dipole moment
21.
(a)
3μf
22.
(b)
greater than 90°
23.
(a)
\(\overset { \rightarrow }{ E } =\frac { 1 }{ 4\pi { \varepsilon }_{ 0 } } \int { \frac { \sigma dA }{ { r }^{ 2 } } } \hat { r } \)
24.
(c)
Volume charge density (ρ)
25.
(a)
\(\frac { { q }^{ 2 } }{ 4\pi { \varepsilon }_{ 0 }r } \)
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