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Question

A hemispherical network of radius a is made by using a conducting wire of resistance per unit length 'r'. The equivalent resistance across OP is.
1178487_9b5a1a466f7a4c62b67189c5818130ba.PNG

A
8ar(2+π)
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B
8ar(2π)
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C
(2+π)ar8
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D
(2π)ar8
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Solution

The correct option is C (2+π)ar8
Rop=(ar+π2ar)||(......)||(.....)||(......)
14ar(π2+1)
(π+28)ar

1364082_1178487_ans_6b4ea8cf1a824498bdcfbfde8e96f854.png

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