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A pitch ball covered with a tin foil having a mass m kg hangs by a fine silk thread of length r metres in an electric field E. When the ball is given an electric charge of q coulomb, it stands out d metre apart from the vertical line. The magnitude of an electric field will be

A pitch ball covered with a tin foil having a
mass m kg hangs by a fine silk thread of
length r metres in an electric field E. When
the ball is given an electric charge of q
coulomb, it stands out d metre apart from
the vertical line. The magnitude of an electric
field will be
 
 

Grade:12

2 Answers

Shubham Singh
199 Points
7 years ago
The answer is –       mgd     
                         q (r2-d2)1/2
Alfred Pius
24 Points
3 years ago
Found a clue on the internet.
Let the angle made by the string with the vertical be θ. Then tanθ= d/(l^2-d^2)^1/2

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