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In the given figure of meter bridge experiment, the balancing length \mathrm{AC} corresponding to null deflection of the galvanometer is 40 \mathrm{~cm}. The balancing length, if the radius of the wire \mathrm{AB} is doubled, will be ________\mathrm{cm}.

Option: 1

40


Option: 2

-


Option: 3

-


Option: 4

-


Answers (1)

best_answer

For balanced wheatstone network
\mathrm{ \frac{R_1}{R_2}=\frac{R_{A C}}{R_{C B}}=\frac{\rho \frac{\ell_{A C}}{A}}{\frac{\rho \ell_{C B}}{A}}=\frac{\ell_{A C}}{\ell_{C B}} }
The balancing length, if the radius of the wire \mathrm{A B} is doubled has no effect
\therefore The balancing length is \mathrm{40 \mathrm{~cm}}

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chirag

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