Official Class 12 Physics Worksheets: Chapter 01 Electric Charges And Fields
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CBSE Class 12 Physics Electric Charges And Fields Important Questions (1).Students can download these worksheets and practice them. This will help them to get better marks in examinations. Also refer to other worksheets for the same chapter and other subjects too. Use them for better understanding of the subjects.
1 What are the basic properties of electric charge?
2 Give the value of charge on an electron.
3 If 109 electrons move out of a body to another body every second, how much time is required to get a total charge of 1C on the other body?
4 How much positive and negative charge is there in a cup of water?
5 State Coulomb’s law. Give vector form of the equation for finding the force acting between any two charges.
Important Questions for NCERT Class 12 Physics Electric Charges And Fields
Question. Two point charges A and B, having charges +Q and –Q respectively, are placed at certain distance apart and force acting between them is F. If 25% charge of A is transferred to B, then force between the charges
becomes
(a) 4F/3
(b) F
(c) 9F/16
(d) 16F/9
Question. The electrostatic potential inside a charged spherical ball is given by f = ar2 + b where r is the distance from the centre a, b are constants. Then the charge density inside the ball is
(a) –6aε0r
(b) –24paε0
(c) –6aε0
(d) –24paε0r
Question. A hollow insulated conduction sphere is given a positive charge of 10 mC. What will be the electric field at the centre of the sphere if its radius is 2 m?
(a) Zero
(b) 5 mCm–2
(c) 20 mCm–2
(d) 8 mCm–2
Question. Suppose the charge of a proton and an electron differ slightly. One of them is –e, the other is (e + De). If the net of electrostatic force and gravitational force between two hydrogen atoms placed at a distance d (much greater than atomic size) apart is zero, then De is of the order of
[Given: mass of hydrogen mh = 1.67 × 10–27 kg]
(a) 10–23 C
(b) 10–37 C
(c) 10–47 C
(d) 10–20 C
Question. Which of the following pair of quantities do not have the same dimensions :
(a) Potential gradient, electric field
(b) Torque, kinetic energy
(c) Light year, time period
(d) Impedance, reactance
Question. Two identical charged spheres suspended from a common point by two massless strings of lengths l, are initially at a distance d (d < < l) apart because of their mutual repulsion. The charges begin to leak from both the spheres at a constant rate. As a result, the spheres approach each other with a velocity v.
Then v varies as a function of the distance x between the spheres, as
(a) v ∝ x–1/2
(b) v ∝ x–1
(c) v ∝ x1/2
(d) v ∝ x
Question. The potential at a point P due to an electric dipole is 1.8 × 105V. If P is at a distance of 50 cm apart from the centre O of the dipole and if CP makes an angle 60° with the positive side of the axial line of the dipole, what is the moment of the dipole?
(a) 10 C–m
(b) 10–3 C –m
(c) 10–4 C–m
(d) 10–5 C–m
Question. Two point charges +q and –q are held fixed at (–d, 0) and (d, 0) respectively of a x – y coordinate system. Then
(a) the electric field E at all points on the axis has the same direction
(b) work has to be done in bringing a test charge from ¥ to the orgin
(c) electric field at all points on y-axis is along x-axis
(d) the dipole moment is 2qd along the x-axis
Question. When air is replaced by a dielectric medium of constant K, the maximum force of attraction between two charges separated by a distance
(a) increases K times
(b) remains unchanged
(c) decreases K times
(d) increases K–1 times.
Question. A charge q is placed at the centre of the line joining two equal charges Q. The system of the three charges will be in equilibrium if q is equal to
(a) –Q/4
(b) Q/4
(c) –Q/2
(d) Q/2
Question. “Parsec” is the unit of :
(a) time
(b) distance
(c) frequency
(d) angular acceleration
Question. Point charges +4q, –q and +4q are kept on the X-axis at point x = 0, x = a and x = 2a respectively. Then
(a) only –q is in stable equilibrium
(b) all the charges are in stable equilibrium
(c) all of the charges are in unstable equilibrium
(d) none of the charges is in equilibrium.
Question. An electron falls from rest through a vertical distance h in a uniform and vertically upward directed electric field E. The direction of electric field is now reversed, keeping its magnitude the same. A proton is allowed to fall from rest in it through the same vertical distance h. The time of fall of the electron, in comparison to the time of fall of the proton is
(a) smaller
(b) 5 times greater
(c) 10 times greater
(d) equal
Question. An electric shock is experienced on opening the door of a car due to
a) heating of car engine
b) discharge of electric charge
c) motion of car
d) None of the above
Answer : B
Question. If two bodies are rubbed and one of them acquires q1charge and another acquires q2 charge, then ratio of q1 : q2 is
a) 1 : 2
b) 2 : 1
c) - 1 : 1
d) 1 : 4
Answer : C
Question. The ratio of electric fields on the axis and at equator of an electric dipole will be
a) 1 : 1
b) 2 : 1
c) 4 : 1
d) None of these
Answer : B
Question. In charging by induction,
a) body to be charged must be an insulator
b) body to be charged must be a semiconductor
c) body to be charged must be a conductor
d) any type of body can be charged by induction
Answer : C
Question. The Coulomb’s law is based on the assumption that
charges are treated as
a) positive charges
b) negative charges
c) neutral charges
d) point charges
Answer : D
Question. If point charges Q1 = 2×10-7 C and Q2= 3 ×10-7 C are at 30 cm separation, then find electrostatic force between them.
a) 2 × 10-3 N
b) 6 × 10-3 N
c) 5 × 10-3 N
d) 1 × 10-3 N
Answer : B
Question. A soap bubble is given a negative charge, then its radius
a) decreases
b) increases
c) remains unchanged
d) nothing can be predicted as information is insufficient
Answer : B
Question. For two charges q1 and q2, if force between them for some separation in air is F, then force between them in a medium of permittivity e will be
a) ε0/ε F
b) ε/ε0 F
c) εε0 F
d) F/ε0ε
Answer : A
Question. When the charge of a body becomes half, the electric field becomes
a) half
b) twice
c) thrice
d) No change
Answer : A
Question. Two field lines can never cross each other because
a) field lines are closed curves
b) field lines repels each other
c) field lines crowded only near the charge
d) field has a unique direction at each point
Answer : D
Question. The electric field at a point is
a) always continuous
b) continuous, if there is no charge at that point
c) continuous, if there is a charge at that point
d) None of the above
Answer : B
Question. The surface charge density s of an area element ignores
a) the quantisation of charge
b) discontinuity in charge distribution at macroscopic level
c) discontinuity in charge distribution at microscopic level
d) Both (a) and (c)
Answer : D
Question. A hollow metal sphere of radius R is uniformly charged.
The electric field due to the sphere at a distance r from the centre
a) zero as r increases for r < R, decreases as r increases for r > R
b) zero as r increases for r < R, increases as r increases for r > R
c) decreases as r increases for r < R and for r > R
d) increases as r increases for r < R and for r > R
Answer : A
Question. A uniformly charged conducting sphere of 2. 4m diameter has a surface charge density of 80 mCm-2.
What is the charge on the sphere?
a) 0.7 × 10 -1 C
b) 1.4 × 10 -2 C
c) 1.4 × 10 -3 C
d) 1.7 × 104 C
Answer : C
Question. Total electric flux coming out of a unit positive charge put in air is
a) ε0 ε0/ε
b) ε0-1
c) (4pε0 )-1 pe
d) 4πε0
Answer : B
Question. A charged particle is free to move in an electric field. It will travel
a) always along a line of force
b) along a line of force, if its initial velocity is zero
c) along a line of force, if it has some initial velocity in the direction of an acute angle with the line of force
d) None of the above
Answer : B
Question. If ∫S E.dS = 0 over a surface, then
a) the electric field inside the surface and on it is zero
b) the electric field inside the surface is necessarily uniform
c) the number of flux lines entering the surface must be equal to the number of flux lines leaving it
d) None of the above
Answer : C
Question. If same charge q is placed inside a sphere and cube having radius 1m and side 2m, respectively. What will be the ratio
of flux passing through them?
a) 1 : 1
b) 1 : 8
c) 8 : 1
d) 1 : 2
Answer : A
Question. What is the force between two small charged spheres having charges of 2 × 10-7 C and 3 × 10 -7 C placed 30 cm apart in air?
a) 5 × 10-2N
b) 6 ×10-3N
c) 7 × 10-4N
d) 8 × 10-4N
Answer : B
Question. Two point charges qA = 3μC and qB = -3μC are located 20 cm apart in vacuum. What is the electric field at the mid-point O of the line AB joining the two charges?
a) 0
b) 2.7× 106 (N/C)
c) 5.4 × 106 (N/C)
d) 10.2 × 106 (N/C)
Answer : C
Question. A point charge of20.μ C is at the centre of a cubic Gaussian surface 9.0 cm on edge. What is the net electric flux through the surface?
a) 0
b) 2 × 102 Nm2 /C
c) 2 × 104 Nm2 /C
d) 2 × 105 Nm2 /C
Answer : D
Question. A conducting sphere of radius 10 cm has an unknown charge. If the electric field 20 cm from the centre of the sphere is 1.5 × 103 N/C and points radially inwards, what is the net charge on the sphere?
a) 0
b) 5 × 10-5 C
c) 6 × 10-9 C
d) 8 × 10-10 C
Answer : C
Question. An infinite line charge produces a field of 9 × 104 NC-1 at a distance of 2 cm. Calculate the linear charge density.
a) 10-5Cm-1
b) 10-6 Cm-1
c) 10-7 Cm-1
d) 10-8 Cm-1
Answer : C
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Chapter 01 Electric Charges And Fields Printable Worksheets and Exercises for Class 12 Physics
Practice Exercises for Class 12 Physics Chapter 01 Electric Charges And Fields
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