Consider a wheatstone bridge `PQRS` as shown in Fig. 7.19` where current I is in the circuit of four resistances 10 ,20 ,30, and 40 Omega . Find the ratio of the heat generated in the four arms `PQ,QR, PS, and SR`.

Explanation

To solve the problem of finding the ratio of heat generated in the four arms of the Wheatstone bridge `PQRS`, we will follow these steps:

### Step 1: Identify the resistances
The resistances in the Wheatstone bridge are given as follows:
- \( R_{PQ} = 10 \, \Omega \)
- \( R_{QR} = 20 \, \Omega \)
- \( R_{PS} = 30 \, \Omega \)
- \( R_{SR} = 40 \, \Omega \)
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