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Published on: 23/08/2019
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 is placed in a uniform external electric field parallel to the field, it will experience_________.
a torque but no force
a force but no torque
a torque as well as a force
neither a force nor a torque
2.
Near a charged object A another earthed object B is placed. Charges are induced on B. If B is removed. After that the charge on A ________.
remains the same
decreases
increases
becomes zero
3.
Electric field intensity and electric potential are related by_________.
E = -\(\frac{dV}{dt}\)
E = -\(\frac{dV}{dx}\)
E = \(\frac{dV}{dt}\)
E = \(\frac{-dx}{dV}\)
4.
By using law of conservation of electric charge balance the following equations:
92U238 ⇾ 90Th234 +________.
2He4
1H3
1H2
1H1
5.
The value of relative permittivity of air is
8.854 x 10-12C2N-1m-2
9 x 109 C2 N-1m-2
1
8.854 x 1012
6.
The force between two charges at a particular distance in air is 36 N. If the distance between the charges is filled by a medium of dielectric constant 6, then the force is:
216 N
6 N
30 N
24 N
7.
Which of the following is a scalar quantity?
electric dipole moment
electric field intensity
electric potential
current density
8.
Electrostatic force is stroger than gravitational force by_________.
2.23 x 1039 times
2.25 x 1039 times
2.27 x 1039 times
2.29 x 1039 times
9.
For continuous charge distributions, _____ methods can be used.
integration
differentiation
multiplication
addition
10.
The electric flux over a sphere of radius 1m is ф. If radius of the sphere were doubled without changing the charge enclosed, electric flux would become
2ф
\(\\ \\ \\ \frac { \phi }{ 2 } \)
\(\\ \\ \\ \frac { \phi }{ 4 } \)
ф
11.
A charge q is placed at the centre of a cubical box of side with top open. The flux of electric field through the surface of the cubical box is
Zero
\(\frac { q }{ { \varepsilon }_{ 0 } } \)
\(\frac { q }{ 6{ \varepsilon }_{ 0 } } \)
\(\\ \frac { 5q }{ 6{ \varepsilon }_{ 0 } } \)
12.
Two copper spheres A and B of same size are charged to same potential. A is hollow and B is solid. Which of the two holds more charge?
Solid sphere cannot hold any charge
hollow sphere cannot hold any charge
both have zero charge
both have the same charge
13.
An electric dipole placed at an angle in a nonuniform electric field experiences
neither a force nor a torque
torque
both force and torque
force only
14.
Increasing the charge on the plates of a capacitor means ___________
increasing the capacitance
increasing the potential difference between the plates
both (a) and (b) above
none of the above
15.
Two condensers (capacitors) of capacity C1 and C2 are connected in parallel. A charge Q given to then is shared. The ratio of the charges Q is _________
\(\frac { { C }_{ 2 } }{ { C }_{ 1 } } \)
\(\frac { { C }_{ 1 } }{ { C }_{ 2 } } \)
C1.C2
\(\frac { 1 }{ { C }_{ 1 }\times { C }_{ 2 } } \)
16.
The electric field created by a _________ is basically a non-uniform electric field.
Test charge
Positive charge
Negative charge
Point charge
17.
Which one of these is a vector quantity?
Electric charge
Electric field
Electric flux
Electric potential
18.
The relative permittivity of water is _______.
εr = 70
εr = 75
εr = 80
εr = 85
19.
The value of constant 'K' in coulomb law is _____________.
0.9 x 109 Nm2 C2
9 x 10-9 Nm2C2
9 x 109 Nm-2 C-2
9 x 109 Nm2 C-2
20.
Two metallic spheres of radii 1 cm and 3 cm are given charges of -1 \(\times\) 10-2 C and 5 \(\times\) 10-2 C respectively. If these are connected by a conducting wire, the final charge on the bigger sphere is
3 \(\times\) 10-2 C
4 \(\times\) 10-2 C
1 \(\times\) 10-2 C
2 \(\times\) 10-2 C
21.
If voltage applied on a capacitor is increased from V to 2V, choose the correct conclusion.
Q remains the same, C is doubled
Q is doubled, C doubled
C remains same, Q doubled
Both Q and C remain same
22.
Which charge configuration produces a uniform electric field?
point charge
uniformly charged infinite line
uniformly charged infinite plane
uniformly charged spherical shell
23.
Two identical point charges of magnitude –q are fixed as shown in the figure below. A third charge +q is placed midway between the two charges at the point P. Suppose this charge +q is displaced a small distance from the point P in the directions indicated by the arrows, in which direction(s) will +q be stable with respect to the displacement?
A1 and A2
B1 and B2
both directions
No stable
1.
(b)
a force but no torque
2.
(a)
remains the same
3.
(b)
E = -\(\frac{dV}{dx}\)
4.
(a)
2He4
5.
(c)
1
6.
(b)
6 N
7.
(c)
electric potential
8.
(c)
2.27 x 1039 times
9.
(a)
integration
10.
(d)
ф
11.
(d)
\(\\ \frac { 5q }{ 6{ \varepsilon }_{ 0 } } \)
12.
(d)
both have the same charge
13.
(c)
both force and torque
14.
(b)
increasing the potential difference between the plates
15.
(b)
\(\frac { { C }_{ 1 } }{ { C }_{ 2 } } \)
16.
(d)
Point charge
17.
(b)
Electric field
18.
(c)
εr = 80
19.
(d)
9 x 109 Nm2 C-2
20.
Q = q1 + q2 = 4 x 10-2C
\(q_{2f}=Q[\frac{r_2}{r_1+r_2}]\)
= 4 x 10-2 \([\frac{3}{4}]\)
q2f = 3 x 10-2 C
21.
If voltage is increased from V to 2 V
Then Q1 = CV
Q2 = C(2 V) = 2 CV
∴ Q is doubled and C remains same
22.
(c)
uniformly charged infinite plane
23.
The charge + q will be stable between B1 and B2 with respect to the displacement.
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