Two isolated copper sphere A & B of identical size have charge qA & -3qA respectively.when they're brought into contact with each other & then separated. what are the new charges on them ?
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12th
Physics
Electric Charges and Fields
Problems Based on Coulomb's Law
Two identical conducting sp...
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Asked on October 15, 2019 by
Namit Balamurugan
Two identical conducting spheres A and B, carry equal charge. They are separated by a distance much larger than their diameter, and the force between them is F. A third identical conducting sphere, C, is uncharged. Sphere C is first touched to A, then to B, and the removed. As a result, the force between A and B would be equal to
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Initially charges on both sphere, q
F=
d
2
Kq
2
.............(1)
When sphere C will get touched with sphere A, then final charges on both will become
2
q
.
Now, when this sphere C will get touched to sphere B, then final charges on both of them will be
q
c
=q
d
=
2
q/2+q
=
4
3q
Now force between A and B will be
F
′
=
d
2
k×
2
q
×
4
3q
F
′
=
8
3F
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