Question

What is the effect on null deflection of galvanometer, when the radius of the wire is tripled?

(a) No change

(b) Becomes half

(c) Reduces by 1/3

(d) Thrice the original value​

Answer 1

Answer:

a) no change

Explanation:

because it remains same

Answer 2

Answer:

There is no change  to the effect on null deflection of galvanometer, when the radius of the wire is tripled.

Explanation:

We can see that the null deflection of a galvanometer is independent of the wire radius.

As a result, even if the wire's radius is tripled,

the galvanometer's null deflection remains unchanged.

At null condition $\frac{R_{} 1}{R_{2} } = \frac{x}{100-x }$

Thus, null condition is independent of radius of wire $xy$.

As a result, when the radius is tripled, the null position remains the same.

so right option is $a$: no change