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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

ria , 10 Years ago
Grade 12
anser 2 Answers
Shubham Singh

Last Activity: 10 Years ago

The answer is –       mgd     
                         q (r2-d2)1/2

Alfred Pius

Last Activity: 6 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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