ASSIGNMENT
CLASS 10+2, UNIT 1 (ELECTROSTATICS)
Important Questions from Electrostatics
Jaswinder
Singh (Lect in Physics)
physsrsms@gmail.com
1)
Define dielectric constant.
2)
State the properties of electric charge.
3)
Give the SI unit of absolute permittivity
of free space.
4)
State and define Coulombs Law. Give its
vector form. What is the importance of Coulomb’s Law in vector form. Also give the limitations of coulomb Law.
5)
Define electric dipole and electric
dipole moment. Give SI units of electric dipole moment.
6)
Derive
an expression for Electric Field on axial line of an electric dipole.
7)
Derive an expression for Electric Field
on equatorial line of an electric dipole.
8)
Derive an expression for torque, when an
electric dipole is placed in uniform electric field.
9) What
is the nature of force between two charges if q1q2
> 0?
10) What
is the nature of force between two charges if q1q2
<0?
11) What
is SI unit of solid angle?
12) How
many electrons are present in one coulomb of charge?
13) Why
no two equipotential surfaces intersect each other?
14) If
you are provided with capacitors of small capacities, how can you obtain a
larger capacity from them?
15) Why
no two electric lines of force intersect each other?
16)
Define Capacitance of a capacitor. Give
its SI Unit.
17) Name
the physical quantity, whose S.I unit is Joule per coulomb. Is it scalar or
vector.
18)
State and prove Gauss’ theorem. What is
the importance of Gauss’ theorem.
19)
Derive an expression for the electric field
due to uniformly charged thin spherical shell at a point (a) inside (b) outside
(c) on the surface of charged thin spherical shell.
20)
Define electric flux .Give its SI units
and dimensional formula.
21)
Using Gauss’ theorem find electric field
due to a infinite line charge.
22)
Derive an expression for electric
potential at any point due to an electric dipole. Hence find electric potential
on axial and equatorial line.
23)
Prove that no work is done in moving a
test charge over an equi-potential surface.
24)
Prove that electric field is always at
right angles to the equi-potential surface.
25)
Draw equi-potential surface for an
isolated point charge and for uniform electric field.
26)
Give the difference between insulator
and dielectric.
27)
Define capacitance and derive an
expression for the capacitance of a parallel plate capacitor.
28)
Derive an expression for capacitance of
a parallel plate capacitor when a dielectric slab of dielectric constant K is
introduced between the plates of capacitor.
29)
Derive an expression for capacitance of
a parallel plate capacitor when a conducting slab is introduced between the
plates of capacitor.
30)
Derive an expression for energy stored
in a charged capacitor. In what form energy is stored in a charged capacitor.
31)
Discuss the principle, construction and
working of Van de Graaff generator.
32)
What is the principal of electrostatic
shielding?
33)
Can a metal sphere of radius 1 cm hold a
charge of 1 coulomb?
34)
27 drops of same size are charged at 220
V each. They coalesce to form a bigger drop. Calculate the potential of the
bigger drop.
35)
Name the physical quantity , whose SI
unit is Volt/metre.
36)
The electric potential is constant in a
region. What can you electric field there?
37)
If the electric field at a given point
is zero, must the electric potential be also zero at that point?
38)
A regular hexagon of side 10 cm has a
charge 5 μC at each of its vertices. Calculate the potential at the centre of
the hexagon.
39)
Two charges 3*10-8 C and
-2*10-8 C are located 15 cm apart. At what point on the line joining
the two charges is the electrical potential zero?
40)
Two point charges of 5*10-19
C and 20*10 -19 C are separated by a distance 2m.Find the point on
the line joining them at which electric field is zero.
41)
Two charges each of +Q units are placed
along a line. A third charge –q is placed between them. At what position and
for what value of q, will the system be in equilibrium?
42)
Calculate the coulomb’s force between
two α particles separated by
a distance of 3.2*10-15 m.
43)
Three capacitors of equal capacitance,
when connected in series, have a net capacitance C1 and when
connected in parallel, have a capacitance of C2.What will be the
value of C1/C2 ?
44)
How much work must be done to charge a
24 μC capacitor, when the potential difference between the plates is 500 V?
Jaswinder Singh (Lect. in
Physics)
physsrsms@gmail.com
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