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Physics 10 Chapter 13 - Electrostatics - 11
1.
What is the value of ‘K’, if the medium between the two charges is air?
a) 9 ×10
9
Nm
2
C
-2
b) 10 ×10
8
Nm
2
C
-2
c) 10 ×10
9
Nm
2
C
-2
d) 9 ×10
8
Nm
2
C
-2
2.
According to Coulomb’s law, what happens to the attraction of two oppositely charged objects as their distance of separation decreases?
a) Cannot be determined
b) Remains unchanged
c) Increases
d) Decreases
3.
In which medium, the value of ‘K’ is 9 ×10
9
Nm
2
C
-2
?
a) Air
b) Mecca
c) Copper
d) Gasoline
4.
What is true about point charges?
a) Sizes are equal to the distance between them
b) Sizes are very small as compared to distance between them
c) Distance between them is equal to their sizes
d) Distance between them is very small as compared to sizes
5.
Which of the following law, electric forces obey?
a) Newton’s third law of motion
b) Newton’s second law of motion
c) Newton’s first law of motion
d) Newton’s law of gravitation
6.
The Coulomb’s law is valid for the charges which are.........?
a) Moving and non-point charges
b) Moving and point charges
c) Stationary and large size charges
d) Stationary and point charges
7.
A positive and a negative charge are initially 4 cm apart. When they are moved closer together so that they are now only 1 cm apart, the force between them is......................?
a) 4 times larger than before
b) 4 times smaller than before
c) 8 times larger than before
d) 16 times larger than before
8.
Two bodies are oppositely charged with 500 µC and 100 µC charge. Find the force between the two charges if the distance between them in air is 0.5 m?
a) 180 N
b) 1800 N
c) 50,000 N
d) 5000 N
9.
If the charge qo is moved away from q, this force would.....................?
a) Increase
b) Not produced
c) Have no effect
d) Decrease
10.
What is the SI unit of ‘K’?
a) Nm
-2
C
-2
b) Nm
2
C
2
c) Nm
-2
C
2
d) Nm
2
C
-2
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