Question

5
If the resistance of the left gap of the meter
bridge is doubled keeping the right gap
resistance unchanged then to which direction
the balancing length will shift? Explain
(2 Points)​

Answer 1

Answer:

Resistance in right gap R=1Ω

Let the unknown resistance be P.

Balancing length l=20cm

Using Wheat-stone bridge equation,  

R

P

​  

=  

100−l

l

​  

 

∴  

1

P

​  

=  

100−20

20

​  

 

OR  

1

P

​  

=  

80

20

​  

 

⟹ P=  

4

1

​  

=0.25Ω

Explanation: