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A pitch ball covered with a tin foil having amass m kg hangs by a fine silk thread oflength r metres in an electric field E. Whenthe ball is given an electric charge of qcoulomb, it stands out d metre apart fromthe vertical line. The magnitude of an electricfield will be

ria , 9 Years ago
Grade 12
anser 2 Answers
Shubham Singh

Last Activity: 9 Years ago

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

Alfred Pius

Last Activity: 5 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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