1.

In a meter bridge a 30Omega resistance is connected in the left gap and a pair of resistance p and Q in the gap . Measured from the left , the balance point is 37.5 cm When they the parallel. The values of P and Q (inOmega ) are

Answer»

`(40,10)`
35, 15
30,20
25, 25

Solution :Consider the LOOP BCFE
`(i_1+i_2) 12+ (i_2xx1)-10 = 0`
`12i_1+13i_2= 10`
Consider the loop ABCEFED
`10 - (i_2xx1)+(i_1xx0.5)-6=0`
`0.5i_1-i_2= -4`
Solving equation (1) and (2, we GET, `i_L = 2.865A`


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