Question

in a meter bridge,what is the effect on null deflectionof galvanometer,when the radius of meter bridge wire is doubled.
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Answer 1

Answer:Correct option is

A

x

At null condition,  

R  

2

​

 

R  

1

​

 

​

=  

100−x

x

​

 

Thus, null condition is independent of the radius of the AB wire. So when the radius is doubled, the null position will remain the same i.e x

Explanation:

Answer 2

Answer: No effect as null position will remain same.

Explanation:

At Null Deflection of Galvanometer

$\[\frac{{{R_2}}}{{{R_1}}} = \frac{X}{{100 - X}}\]$

Thus,

Null condition is independent of radius of meter bridge wire. So when radius of meter bridge is doubled, null position will remain same.

Hence, Effect on null deflection of galvanometer , when the radius of meter bridge wire is doubled is none as null position will remain same.