Class 12 Electrostatics
Watch the lecture on Electrostatics
Answer the questions given below
Electric Charges and
Fields Chapter
1
Fill in the blanks
1.
The property which differentiates the two kinds of charges is
called the _____________ of charge.
2.
A simple apparatus to detect charge on a body is called
_______________ electroscope.
3.
To electrify a neutral body, we need ____________ or ___________
one kind of charge.
4.
Some substances readily allow passage of electricity through
them are called ______________
5.
When we bring a charged body in contact with the earth, all the
excess charge on the body disappears by causing a momentary current to pass to
the ground through the connecting conductor (such as our body). This process of
sharing the charges with the earth is called ________________.
6.
Metallic bodies of the electric appliances such as electric
iron, refrigerator, TV are connected to the
________ wire. When any fault occurs or live
wire touches the metallic body, the charge flows to
the _______ without damaging the
appliance and without causing any injury to the humans
7.
The total charge of a system containing five charges +1, +2, –3,
+4 and –5, in some arbitrary unit,
Is __________.
8.
The total charge of an isolated system is always ______________.
9.
The fact that electric charge is always an integral multiple of
e is termed as _______________ of charge.
10. The quantization of charge
was first suggested by the experimental laws of electrolysis discovered by
English experimentalist _______________.
11. It was experimentally
demonstrated by __________ in 1912.
12. The value of the basic unit
of charge is____________________.
13. The force between two point
charges and found that it varied inversely as the square of the distance
between the charges and was directly proportional to the product of the
magnitude of the two charges and acted along the line joining the two charges.
This law is known as _________________.
14. The value of k = 1/4ε0 in SI units is _________________.
15. The value of ε0 in SI units
is εo = ___________________ C2 N–1m–2
16. Electric field due to
positive charge is _______________ and that due to negative charge is
_____________.
17. The direction of an area
element is along its ____________________.
18. The unit of electric flux is ______________.
19. An electric dipole is a pair
of _____ and ________ point charges, separated by a distance 2a.
20. The direction from _____ to ______
is said to be the direction of the dipole.
21. The _________ of –q and q
is called the centre of the dipole.
22. The total charge of the
electric dipole is ______________.
23. The dipole field at large
distances falls off not as 1/r 2 but as __________.
24. The magnitude and the direction
of the dipole field depends not only on the distance r but also on the _____
between _________ and ___________.
25. Molecules with permanent
electric dipole moment are called ______________.
26. At __________________ angle a
dipole has max torque in uniform electric field and minimum at
_________________ angle.
27. Electric flux through a
closed surface S is __________.
28. The total electric flux
through a closed surface is zero if no __________ is enclosed by the surface.
29. Gauss’s law is true for any
closed surface, no matter what its ___________ or _____________.
30. Electric field inside a
charged
One word answer questions
1. What charge appears on
glass rod when rubbed with silk cloth?
2. What charge appears on
plastic rod when rubbed with cat fur?
3. Which scientist gave names
to the two charges as positive and negative?
4. When a charged rod is
brought near a charged gold leaf electroscope, if the leaves moves apart what
does it indicate?
5. When a charged conductor
touches another uncharged conductor, what happens?
6. What are the basic
properties of charges?
7. What is the force between
two charges separated by a distance ‘r’ in vacuum?
8. In the above question,
what happens to force if a material medium is introduced between the two
charges?
9. What is relative permittivity?
10. Write the force between
two charges in vector notation.
11. A charge exerts a force 12
N on another charge. What is the force exerted by the second charge on the
first?
12. Which principle is used to
calculate force on a charge due to n numbers of charges?
13. What is the relation
between electric field and distance?
14. What is the SI unit of
electric field?
15. Write two properties of
electric field.
16. What is the SI unit of
electric flux?
17. What is the electric
field on axial line of a dipole?
18. What is the electric
field on equatorial plane of a dipole?
19. Give two examples of non
polar molecules.
20. Write the equation for
torque acting on a dipole in uniform magnetic field.
21. Draw a diagram showing
the stable and unstable equilibrium of dipole in uniform magnetic field.
22. What is linear charge
density, surface charge density and volume charge density?
23. How much flux comes out of a spherical surface
enclosing a charge 2q?
24. In the above question if
the radius of the sphere is increased/ decreased, what flux comes out?
25. What is the electric
field due to charged infinite plane sheet?
Note:
Submit the
answered work sheet by March 30, 2020, to respective email address given below.
Class: 12 A1
to physics1dps@gmail.com
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