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plzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz solve question no 29

plzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz solve question no 29

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Grade:11

1 Answers

Arun
25750 Points
6 years ago
Dear Yash
 
Consider the forces acting on a single one of the charged masses: the force due to the charges is kq2/x2 - x is the radius between the two charges, since it's the distance they're separated by. The force due to gravity is also pretty straightforward: it's simply mg. Since these two forces are perpendicular, they form two sides of a right triangle. The hypotenuse of this triangle is equal to the final force acting on the charged mass, the force of tension. This triangle contains angle θ, since the force of tension is in the direction of the silk thread. Since now we've reintroduced θ, we can start using trigonometry. Tan θ = Opp/Adj, which in this case is our force due to electric charge (F) over the force due to gravity (W), or F/W. However, Tan θ = Sin θ, which equals x/2L when you combine equations, you get 2kq2L = mgx3, and from here it's a simple matter of algebra to get to the final equation.

 

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