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A conducting plate of thickness t is in ...

A conducting plate of thickness `t` is in the shape of an arc. Its inner and outer rim form a `30^(@)` arc of radius `r` and `2r` respectively at point O (see figure). Electric current flows through the strip along circular arcs as indicated in the diagram. find resistance of the plate if its material has conductivity `sigma`.

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The correct Answer is:
`(pi)/(6l n 2 sigma t)`
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