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Problem

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12 Nov 2021

Given information

Given Data :
 
Resistors   
 
The emf of the battery  
 
Internal resistance  
 
The terminal voltage when the switch is open  
 
Assuming three resistors    as   and and internal resistance   are connected to a battery  . 
 

Step-by-step explanation

Step 1.
Consider three resistors and   are as shown in the figure :
 
 
Using the concept of  parallel and series resistance of a resistor :
 
When the switch is opened:
 
From Figure, The equivalent resistance is given by :
 
   
 

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