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chinthalapudi prashanth Grade: 11

Two identical balls are charged by rubbing against each other.They are suspended from a horizontal rod through two stringsof lenghts 20cm each the separation between the suspended points being 5cm.In equilibriumthe separation between the balls is 3cm.find the mass of each ball and tension in the string.the charge on each ball is 0.000000002C (WITH MAGNITUDE).

8 years ago

Answers : (2)

Askiitians Expert Soumyajit IIT-Kharagpur
28 Points

Dear Chinthalapudi Prashanth,

Ans Let the strings make an angle θ with the vertical

then Tcosθ=mg.............(1)

  Tsinθ=K q²/r²...............(2)

Dividing 2 by 1 we get


Solving we get,

m=8×10^-5 Kg. each

N.B: You can also solve it by using moment equations TRY IT.

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Askiitians Experts
Soumyajit Das IIT Kharagpur

8 years ago
ayush aggarwal
4 Points

answer posted by everyone is right but try to solve this problem using lamis theorem . it is the shortest and the best way to solve this

7 years ago
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