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Explain the principle of working of a meter bridge. Draw the circuit diagram for determination of an unknown resistance using it. |
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Answer» Solution :Working of a.metre bridge is based on the principle of Wheatstone.s bridge in which 4 resistances P, Q, R and SALONG with a cell e and galvanometer G are connected as shown. VALUE of four resistances are so adjusted that galvanometer gives no deflection even where kays `K_(1) and K_(2)` are PLUGGED. In such a situation `P/Q=R/S`  Thus, knowing, values of P, Q and R. we can find the value of unknown resistance by using the formula `S=(QR)/(P)`. Circuit diagram for determination of an unknown resistance X using metre bridge is drawn here 
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