In the given potentiometer circuit length of the wire AB is 3m and resistance is R=4.5Ω The length AC for no deflection in galvanometer is :-

Question

In the given potentiometer circuit length of the wire AB is 3m and resistance is R=4.5Ω The length AC for no deflection in galvanometer is :- <img class="img-fluid question-image" alt="Question" src="https://cdn.tardigrade.in/q/nta/p-tjradeow4nzrp87v.jpg" /> (A) 2m (B) 1.8m (C) dependent on r1 (D) None of these

Tardigrade Admin · Accepted Answer

Potential gradient x=((5/0 . 5 + 4 . 5))((4 . 5/3))=1.5Vm- 1 Here (x)(A C)=3⇒ AC=(3/1 . 5)=2m

Q. In the given potentiometer circuit length of the wire $A B$ is $3 m$ and resistance is $R = 4.5Ω$ The length $A C$ for no deflection in galvanometer is :-

$2 m$

$1.8 m$

dependent on $r_{1}$

None of these

Potential gradient
$x = (\frac{5}{0.5 + 4.5}) (\frac{4.5}{3}) = 1.5 V m^{- 1}$
Here $(x) (A C) = 3 \Rightarrow A C = \frac{3}{1.5} = 2 m$

Q. In the given potentiometer circuit length of the wire AB is 3m and resistance is R=4.5Ω The length AC for no deflection in galvanometer is :-

2m

1.8m

dependent on r1​