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A circle is consturcted of a uniform wire of resistance of 2 ohm per cm and is connected in a circuit such that it offers maximum resistance. (Take redius of the circle as 7 cm).
`R/l = (2Omega)/(cm) pir^(2)`
`R prop l/a`
`R/l = (l)/(a)`

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Best answer
(i) Find the length of the wire forming circle, `l = 2 pir`
(ii) The effective resistance of a parallel combination is always less than least value of resistance in the combination.
(iii) Take such that the valueof resistance of the segment from the circle has maximum possible resistance.
(iv) `(1)/(R_("effective")) = (1)/(R_(1)) + 1/(R_(2))`
(v) take `R_(1) = R_(2) = (2 "ohm cm"^(-1)) xx (44 cm)/(2)`
(vi) Find `R_(eff)` from (2).
(vii) `22 Omega`

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