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A thread carrying a uniform charge lambd...

A thread carrying a uniform charge `lambda` per unit length has the configuration as shown in figure. If radius ‘R’ is considerably length 'the length of the thread then find the magnitude of the electric field strength at the point O. (O is the centre of the quarter circular arc).

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PATHFINDER-ELECTROSTATICS-I, II AND III-QUESTION BANK
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  10. Find potential difference after switch, S is closed?

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