Figure below shows a balanced Wheat stone's network. If it is distributed by changing P to 22 ` Omega `, then which of the following steps will bring the bridge to balance again ?

Options

A. increasing S by ` 3 Omega `
B. increasing Q by 20 ` Omega `
C. Both (a) and (b)
D. increasing R by ` 50 Omega `

Answer

C

Explanation

Condition of balanced wheat stone's bridge is
` (P ) /( Q ) = ( S) /( R) `
For option (a) , ` ( 22 )/( 200) = ( 33 ) /( 300 ) `
For option (b), ` (22 ) /(200) = ( 30 ) /( 300 ) `
For option (c ) , ` ( 22 ) /( 200 ) ne ( 30 ) /( 350 ) `
Thus, bridge will balance again by
(1) increasing S by ` 3 Omega ` and
(2 ) Increasing Q by ` 20 Omega `