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![[Post New]](/templates/default/images/icon_minipost_new.gif) 21 Jul 2007 14:58:09 IST
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A resistance of 2 ohm is connected across one gap of a metre-bridge(length of the wire is 100cm) and an unknown resistance , greater than 2 ohm is connected across the other gap.When these resistances are interchanged ,the balance point shifts by 20cm. Neglecting any corrections, the unknown resistance is ____________.
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21 Jul 2007 16:09:36 IST
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Using meterbridge principle R be other resistance and x length in cm of wire across 2 ohm resi. 1) 2/R =x/(100-x) 2) R/2=(x+20)/(80-x) Now solve these 2 eqn.s 4m 2nd eq.n take 2/R and equate
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21 Jul 2007 19:09:15 IST
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answer is 3 ohm
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you are in the competition to beat the competition
you work hard for a desired result |
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