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# Explain with a neat circuit diagram how you will determine unknown resistance using meter bridge.

Last updated date: 19th Jun 2024
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Hint:A meter bridge is used to find an unknown resistance using some known resistances. It works on the principle of wheat stone’s bridge. When the circuit is balanced, the condition for balancing of the bridge is used to find the value of unknown resistance.

A galvanometer is connected in the circuit, in such a way that its one end is connected in between the resistances X and Y. The other end is moveable and placed on the wire. A meter bridge works on the principle of Wheatstone’s bridge. To find the value of the unknown resistance (Y), the circuit is balanced. When the circuit is balanced, there is zero or minimum current in the galvanometer. The length of the wire (l) is called balancing length. Then we use the condition for balancing, i.e. $\dfrac{X}{l}=\dfrac{Y}{100-l}$. With this, we can calculate the value of unknown resistance, since the values of X and l are known.