A particle of mass m and carrying charge -q1 is moving around a charge +q2 along a circular path of radius r . Find period of revolution of the charge -q1
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4
Suppose in the following figure, equilibrium of charge B is considered. Hence for it's equilibrium |FA| = | FC|
⇒
1
4
π
ε
0
Q
2
4
x
2
=
1
4
π
ε
0
q
Q
x
2
⇒
q
=
−
Q
4
Short Trick : For such type of problem the magnitude of middle charge can be determined if either of the extreme charge is in equilibrium by using the following formula.
If charge A is in equilibrium then q = –
Q
B
(
x
1
x
)
2
If charge B is in equilibrium then
q
=
−
Q
A
(
x
2
x
)
2
If the whole system is in equilibrium then use either of the above formula.
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6
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