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Electric Charges and Fields
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Problems Based on Coulomb's Law
Problems Based on Coulomb's Law
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Coulomb's Law - Problem L1
Example
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Problem on Coulomb's Law Involving SHM
2 mins
Coulomb's Law - Problem L1
2 mins
Important Questions
What is the force between two small charged spheres having charges of
2
×
1
0
−
7
C and
3
×
1
0
−
7
C placed 30 cm apart in air?
Medium
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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
Medium
NEET
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The electrostatic force of repulsion between two equal positively charged ions is
3
.
7
×
1
0
−
9
N
, when they are separated by a distance of
5
A
∘
. How many electrons are missing from each ion?
Medium
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The electrostatic force on a small sphere of charge
0
.
4
μ
C
due to another small sphere of charge
−
0
.
8
μ
C
in air is 0.2 N.
(a) What is the distance between the two spheres?
(b)
What is the force on the second sphere due to the first?
Medium
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Charge
Q
, is divided into two parts which are then kept some distance apart. The force between them will be maximum if the two parts are having the charge.
Medium
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Suppose the charge of a proton and an electron differ slightly. One of them is -e, the other is
(
e
+
Δ
e
)
. 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
Δ
e
is of the order of [Given mass of hydrogen
m
h
=
1
.
6
7
×
1
0
−
2
7
K
g
]
Medium
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(a) Two insulated charged copper spheres A and B have their centres separated by a distance of 50 cm. What is the mutual force of electrostatic repulsion if the charge on each is
6
.
5
×
1
0
−
7
C? The radii of A and B are negligible compared to the distance of separation.
(b)
What is the force of repulsion if each sphere is charged double the above amount, and the distance between them is halved?
Medium
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The force between two charges 0.06 m apart is
5
N
. If each charge is moved towards the other by
0
.
0
1
m
, then the force between them will become
Hard
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Two similarly and equally charged identical metal spheres A and B repel each other with a force of
2
×
1
0
−
5
N
. A third identical uncharged sphere C is touched with A and then placed at the midpoint between A and B. Find the net electric force on C :
Hard
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When the distance between two charged particles is halved, then the force between them becomes :
Medium
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>