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A metallic conductor at `10^(@)C` connected in the left gap of meter bridge gives balancing length 40 cm. When the conductor is at `60^(@)C`, the balancing point shifts by --- cm, (temperature coefficient of resistance of the material of the wire is `((1)/(220))/(.^(@)C))`A. 4.8B. 10C. 15D. 7 |
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Answer» Correct Answer - A `(X)/(R)=(40)/(60)=(2)/(3),(X_(0)(1+alphat_(1)))/(R)=(2)/(3)` `(X_(0)(1+alphat_(2)))/(R)=(l)/(100-l)` `(1+alphat_(1))/(1+alphat_(2))=(2)/(3)xx[(100-l)/(l)]` `l=44.8` Balancing point shift by `=44.8-40=4.8` |
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