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Q.

A meter bridge setup is shown in the figure. It is used to determine an unknown resistance R using a given resistor of 15 Ω. The galvanometer (G) shows null deflection when tapping key is at 43 cm mark from end A. If the end correction for end A is 2 cm, then the determined value of R will be________Ω. 

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answer is 19.

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Detailed Solution

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Using the conditions of a balanced wheat stone bridge and adding the end correction.
15(43+2)=R(102−45)⇒R=5745×15R=19Ω

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