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Grade: 11
        Two identical pith balls, each carrying a charge q, are suspended from a common point by two strings of equal length l, Find the mass of each ball if the angle between the strings is 2θ in equilibrium.
5 years ago

Answers : (2)

Aditi Chauhan
askIITians Faculty
396 Points
							Sol. Electric force = kq^2/(ℓ sin Q + ℓ sin Q)^2 = kq^2/4 ℓ^2 sin^2
So, T Cos θ = ms (For equilibrium) T sin θ = Ef
Ef tan θ = Ef/mf
⇒ mg = Ef cot θ = kq^2/4ℓ^2 sin^2θ cot θ = q^2 cot θ/ℓ^2 sin^2θ 16πE  base 0
Or m = q^2 cotθ/16πE  base 0ℓ^2 Sin^2θg

						
5 years ago
Abhishek bains
13 Points
							F=mg tanxqq/16πEl^2 sin^2x tanx=m.......?........................... .............................................................  ............
						
2 years ago
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