Question

The figure below shows a balanced Wheatstone network. If it is disturbed by changing P to 22Ω, then which of the following steps will bring the bridge again to a balanced state?

 

Options

• By increasing S by 3Ω.

• By increasing Q by 20Ω

• By increasing R by 30Ω.

• Both By increasing S by 3Ω and By increasing Q by 20Ω.

Answer 1

Both By increasing S by 3Ω and By increasing Q by 20Ω.

Explanation:

At balanced conditions,

`P/Q = S/R ⇒ 22/200 = 30/300`

So, it can be balanced again by increasing the resistance S by 3Ω or by increasing Q by 20Ω.