Question

Write the principle of working of a meter bridge., in a meter bridge the balance point is found at a distance l2 with resistance r ands as shown in the

Answer 1

FOR FIRST
R/S = L1/100-L1             [1]

WHEN X IS CONNECTED
R/SX/S+X = L2/100-L2           [2]

ON DIVIDING 1 AND 2
S+X/X  =  L1 ( 100-L2)/L2 (100-L1)

WE CAN CALCULATE X FROM ABOVE EQ