Chapter # 12 Electrostatics
Chapter # 12 Electrostatics
Chapter # 12 Electrostatics
CHAPTER # 12
Electrostatics
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The branch of science which deals with study of _______ charges, is called electrostatics:
a) Rest
b) Move
c) Simple
d) None of these
Like charges _______ each other:
a) Attract
b) Repel
c) Contract
d) None of these
Unlike charges _______ each other:
a) Contract
b) Directly
c) Attract
d) Repel
A substance through which an electric current can pass, is called _______:
a) Conductor
b) Charge
c) Electric
d) None of these
The conductor is a substance which contains _______ electrons:
a) Close
b) Open
c) Electric
d) Free
The substance through which an electric current cannot pass, is called _______:
a) Insulator
b) Conductor
c) Plastic
d) Rubber
The insulator is a substance which does not contain _______ electrons:
a) Close
b) Open
c) Free
d) Pass
The force of attraction or repulsion between any two charges is directly proportional to the
magnitudes of the charges and _______ proportional to the square of the distance between them:
a) Inversely
b) Directly
c) Equal
d) Conductor
According to Coulombs law, if q1 and q2 are any two charges and r is distance between
them, then _______:
Kr 2
q 1q 2
2
q 1q 2
a) F =
b) F = K r
Kq 1 r 2
q2
c) F =
d) None of these
The value of K is constant and it depends upon the _______ between the charges:
a) Medium
b) Force
c) Direction
d) None of these
The value of K = _______:
1
1
4 0
6 0
a)
b)
1
1
8 0
10 0
c)
d)
0
The value of in Coulombs law is _______:
a) 4.16 10-11 Nm2
b) 8.85 10-12 C2/Nm2
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2
c) 6.14 10 Nm
d) None of these
The force between two charges decreases by placing an _______ between two charges:
a) Insulator
b) Iron rod
c) Constant
d) None of these
The SI unit of charge is _______:
a) Joule
b) Coulomb
c) Work
d) Kilometer
The amount of charges which passes through a wire in one second when a steady current of 1A is
passing in a wire, is called _______:
a) One Coulomb
b) One Joule
c) One Kilometer
d) None of these
The area near an electric charge with in which it exerts force on another charged particle, is called:
a) Electric Field
b) Particle
c) Source charge
d) Coulomb
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PHYSICS
CHAPTER # 12
Electrostatics
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a) R
b) F
c) C
d) E
If the field charge applies a force F on the test charge qo, then formula for electric intensity is A
_______:
F
q0
q
a) E = 0
b) E = F
c) E = F q0
d) None of these
The SI unit of electric intensity is _______:
A
a) N / Coulomb
b) N2 / Coulomb
c) J / Coulomb
d) None of these
The dimensions of electric intensity are _______:
C
a) ML2T3
b) ML-1T3
c) MLT-2C-1
d) MLT-3C2
The points where the resultant intensity is zero, are called _______:
B
a) Extra points
b) Neutral points
c) Electric field
d) Positive charge
The electric lines of forces start from a positive charge and end on a _______:
A
a) Negative charge
b) Each other
c) Perpendicular
d) Conductor
The electric lines of forces can never _______ each other:
A
a) Intersect
b) Change
c) Parallel
d) None of these
The lines of forces are _______ to the surface of the conductor:
B
a) Intersect
b) Perpendicular
c) Electric
d) None of these
The lines of forces do not exist inside the _______:
A
a) Conductor
b) Image
c) Electric
d) None of these
As we move away from the field the field charge, the density of the lines of force _______:
C
a) Increase
b) Zero
c) Decreases
d) Null
Electric flux is given as :
B
E = E + A
E = E A
a)
b)
c)
= A
d) None of these
Electric flux is a _______ quantity:
A
a) Scalar
b) Vector
c) Zero
d) None of these
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CHAPTER # 12
Electrostatics
When vector area A makes an angle with the electric intensity _______:
A
E
A
a)
b)
+
E =
E =
c)
d) None of these
E = E . A cos
When an angle between E and A is 0o, then flux passing through an area will be _______:
a) Minimum
b) Maximum
c) Zero
d) Full
o
E
A
When an angle between and
is 90 , then flux passing through an area will be _______:
a) Minimum
b) Maximum
c) Zero
d) Null
A
When an angle between and
is greater than 90o, then flux passing through an area will be
_______:
a) Negative
b) Positive
c) Null
d) None of these
When an angle between E and A is less than 90o, then flux passing through an area will be
_______:
a) Negative
b) Null
c) Positive
d) None of these
The formula for the electric flux through the surface of a sphere due to a charge +q at its center is
_______:
q
0
q
a) e = 0
b) e =
c) e = q + 0
d) e = q - 0
According to _______ law, The total electric flux through a closed surface is equal to the product of
1
0
and charge enclosed in the surface.
a) Newtons
b) Gausss
c) Joules
d) None of these
The formula for Gausss law is _______:
1
0 Q
e=
a)
b) e = 0 Q
c) e = 1 2
d) None of these
The work done in moving a unit positive charge from one point to an other point against an electric
field is called _______:
a) Electric field
b) Potential difference
c) Potential
d) Volt
The work done in moving a unit positive charge from infinity to that point against the electric field
intensity is called _______;
a) Absolute potential
b) Volt
c) Joule
d) Coulomb
The unit of potential is _______:
a) Joule
b) Coulomb
c) Volt
d) Newton
The formula for 1 volt = _______:
1 Joule
1 Coulomb
1 Coulomb
1 Joule
a)
b)
1 Kilometer
1Coulomb
c)
d) None of these
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C
A
PHYSICS
CHAPTER # 12
Electrostatics
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The general relation for absolute potential or voltage due to point charge q at a distance r from it, B
is _______:
1
1
q
q
6 0 r
4 0 r
a) V =
.
b) V =
.
1
q
8 0 r
c) V =
.
d) None of these
The potential due to n-point charges is _______:
A
i
n
n
q
q
1
1
i
i
i 1 r
i 1 r
4 0
2
i
i
0
a) V =
b) V =
n i q i
1
i
1 r
3 0
i
c) V =
d) None of these
The surface which have the same value of potential at all points is called _______:
C
a) Concentric surface
b) Equi surface
c) Equipotential surface
d) Charged surface
The value of one electron volt = _______:
A
a) 1 ev = 1.6 10-19J
b) 2 ev = 1.6 10-19J
c) 3 ev = 6.1 10-19J
d) 1 ev = 2.1 10-19J
A capacitor is a device which is used to _______ charges:
D
a) Negative
b) Equal
c) Difference
d) Store
The ratio between charge and potential difference is called _______ of a capacitor:
B
a) Difference
b) Capacitance
c) Intensity
d) None of these
The formula for capacitance is _______:
A
Q
a) C = V
b) C = QV
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V
C
c) C = Q
d) V = Q
The SI unit of capacitance is called a _______:
a) Joule
b) Farad
c) Newton
d) Capability
The capacitor whose capacitance can be changed, is called _______ capacitor:
a) Constant
b) Variable
c) Circular
d) None of these
The capacitor whose capacitance cannot be changed, is called _______ capacitor:
a) Fixed
b) Capacitance
c) Decrease
d) Capacitor
When a charge falls from higher potential to lower potential, it loses P.E. and _______ K.E.:
a) Fixed
b) Gains
c) Loses
d) Move
Atom is a:
a) Positively charged particle
b) Negative charged particle
c) Charged particle
d) Neutral particle
Concept of electric field theory was introduced by:
a) Michael Faraday
b) Newton
c) Dalton
d) Kepler
If electrons are added in an atom, it becomes:
a) Positively charged particle
b) Neutral particle
c) Negatively charged particle
d) None of these
The force per unit charge is known as:
a) Electric volt
b) Electric flux
c) Electric intensity
d) Electric potential
The law that governs the force between electric changes is called:
a) Amperes law
b) Coulombs law
c) Faradays law
d) Ohms law
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B
PHYSICS
CHAPTER # 12
Electrostatics
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PHYSICS
CHAPTER # 12
Electrostatics
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PHYSICS
CHAPTER # 12
Electrostatics
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A capacitor is charged by using a battery, which is then disconnected. A dielectric slab is then C
slipped between the plates, which results in:
a) Reduction of charge on the plates and increase of potential difference across the plates
b) Increase in the potential difference across the plates, reduction in stored energy, but no change in
the charge on the plates
c) Decrease in the potential difference across plates, reduction in stored energy, but no change in
the charge on plates
d) None of the above
Electron volt is the unit of:
B
a) Potential difference
b) Electrical energy
c) Electric current
d) Capacitance
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