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Q.

In a meter bridge experiment is shown in the figure. It is used to determine an unknown resistance ‘R’ using a given resistor of $15 Ω .$ The Galvanometer shows null deflection when key is at 43cm mark from A. If the correction for end ‘A’ is 2cm, then the determine value of R will be ____ $Ω$

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answer is 19.

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Detailed Solution

$x = R (\frac{l_{1}}{100 - l_{1}})$

$15 = R (\frac{43 + 2}{100 - 43})$

$15 = R [\frac{45}{57}]$

$R = 19 Ω$

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In a meter bridge experiment is shown in the figure. It is used to determine an unknown resistance ‘R’ using a given resistor of 15Ω. The Galvanometer shows null deflection when key is at 43cm mark from A. If the correction for end ‘A’ is 2cm, then the determine value of R will be ____ Ω