NCERT Solutions for class 12 Physics | Chapter 1 - Electric Charges and Fields

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Questions
1 If two conducting sphere are connected after charging separately then:
A Electrostatic energy sphere energy will remain conserved
B Electrostatic energy charges remains conserved
C Electrostatic energy energy and charge remains conserved
D None

Answer:Electrostatic energy charges remains conserved
2 Two point charges +8q and -2q are located at ,v = O and ,v = L respectively. The location of a point on the .v-axis at which the net electric field due to these two point charges b is zero :
A 4L
B 8L
C L/4
D 2L

Answer:2L
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3 The conservation of electric charge implies that:
A Charge can’t be created
B Charge can’t be destroyed
C The number of charged particle in the universe is constant
D Simultaneous creation of equal and opposite charges is permissible

Answer:Simultaneous creation of equal and opposite charges is permissible
4 The ratio of electric force between two electrons to the gravitational force between them is of the order:
A 1042
B 1039
C 1036
D 1

Answer: 1042
5 The belt of a Vande Graaf generator gets charge by :
A corona discharge
B induction
C electrification
D None of these

Answer:corona discharge
6 The dimensional representation of cu will be :
A [MLT4 A2]
B [M-1L-3T4A2]
C [ML-2T ]
D None of these

Answer:[M-1L-3T4A2]
7 Each of the two point charges are doubled and their distance is halved. Force of interaction becomes p times, w here p is :
A 1
B 4
C 1/16
D 16

Answer:16
8 The number of electron-taken out from a body to produce 1 coulomb of charge will be :
A 6.25 × 1018
B 625 × 1018
C 6.023 × 1023
D None

Answer:6.25 × 1018
9 Three charges + 3q + q and Q are placed on a st. line with equal separation. In order to maket the net force on q to be zero, the value of Q will be :
A +3q
B +2q
C -3q
D -4q

Answer:+3q
10 Electric field in a cavity of metal:
A depends upon the surroundings
B depends upon the size of cavity
C is always zero
D is not necessarily zero

Answer:is not necessarily zero
11 Corona discharge takes place:
A at the surface of a conductor
B near the sharp points of a conductor
C outside the conductor
D at the centre of the conductor

Answer:near the sharp points of a conductor
12 The number of electrons contained in one coulomb of charge is:
A 6.25 × 1018
B 6.25 × 1017
C 6.25 × 1019
D 1.6 × 1019

Answer:6.25 × 1018
13 1 V m-1 equals to:
A 1 N
B 1 Mm-1
C 1 NC-1
D 1 J-1

Answer:1 NC-1
14 Coulomb’s law in vector form can be written as

Electric Charges and Fields

where ε0 is the permitivity of free space. The SI units of ε0 will be:

A N-1m-2C-2
B Nm-2C2
C N-1m-2C9.y
D Nm-2C2

Answer:N-1m-2C9.y
15 If sphere of bad conductor is given charge then it is distributed on:
A surface
B inside the surface
C only inside the surface
D None

Answer:None
16 If an electric dipole is kept in a uniform electric field then resultant electric force on it is :
A always zero
B never zero
C depend upon capacity of dipole
D None

Answer:always zero
17 Which one of the following is the unit of electric field?
A Coulomb
B Newton
C Volt
D N/C

Answer:N/C
18 1 coulomb is equal to:
A 3 × 109 e.s.u.
B Electric Charges and Fields
C 3 × 1010 e.s.u.
D Electric Charges and Fields

Answer: 3 × 109 e.s.u.
19 The work done in rotating an electric dipole in an electric field:
A W = ME (1 – cos θ)
B W = ME tan θ
C W = ME sec θ
D None

Answer:W = ME (1 – cos θ)
20 The graph drawn between V are r for a non-conducting charged solid sphere of radius R for r < R will be :
A straight line
B parabola
C hyperbola
D None of these

Answer:None of these

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