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A mete bridge is used to determine the ...

A mete bridge is used to determine the resistance of an unknown wire by measuring the balance point length l. If the wire is replaced by another wire of same material but with double the length and half the thickness the balancing point is expected to be

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The bridge is most sensitive when `P/Q = R/S = 1 ` . That is when `l/(100-l)` =1 or `l` = 50 cm . More than 15 cm deviation is not good . So, it is perferable to obtain a balancing length in the middle one third of the wire.
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AAKASH SERIES-CURRENT ELECTRICITY-EXERCISE (VERY ANSWER QUESTIONS)
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  9. Differentiate between ohmic and non -ohmic devices .

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  10. Define one ohm.

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