Question:

In a metre-bridge when a resistance in the left gap is 2 ohm  and unknown resistance in the right gap, the balance length is found to be 40 cm. On shunting the unknown resistance with 2 ohm , the balance length changes by : 

(1) 22.5 cm 

(2) 20 cm 

(3) 62.5 cm 

(4) 65 cm

 

                                           JEE-2024         

Solution:                
In a metre-bridge when a resistance in the left gap is 2 ohm and unknown resistance in the right gap, the balance length is found to be 40 cm. On shunting the unknown resistance with 2 ohm , the balance length changes by : (1) 22.5 cm (2) 20 cm (3) 62.5 cm (4) 65 cm JEE-2024

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