A charge is kept at the central point P of a cylindrical region. The two edges subtend a half-angle at P , as shown in the figure. When =30^ , then the electric flux through the curved surface of the cylinder is . If =60^ , then the electric flux through the curved surface becomes / n , where the va

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A charge is kept at the central point P of a cylindrical region. The two edges subtend a half-angle at P , as shown in the figure. When =30^ , then the electric flux through the curved surface of the cylinder is . If =60^ , then the electric flux through the curved surface becomes / n , where the value of n is _______ .

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Correct answer: A. A

Solid angle made by plane surfaces =2 2 (1- ) =4 -4 So solid angle made by curved surface =4 - aligned & =4 -(4 -4 )=4 \ & _ 30^ = = 4 30^ 4 Q _0 = 30^ Q _0 \ & _ 60 = 4 60^ 4 Q _0 = 60^ Q _0 \ & _ 30 _ 60 = 30^ 60^ = 3 \ & _ 60 = 3 \ & _ 60 = 3 n =3 aligned

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