For what value of R , (in ohm) the current in galvanometer is zero?

Question

For what value of R , (in ohm) the current in galvanometer is zero? <img class="img-fluid question-image" alt="Question" src="https://cdn.tardigrade.in/q/nta/p-pfr145jjuj0m.png" /> (A)  (B)  (C)  (D)

Tardigrade Admin · Accepted Answer

<img class="img-fluid question-image" alt="Solution" src="https://cdn.tardigrade.in/q/nta/p-pfr145jjjt3e.png" /> i=(12/R + 5) Potential difference across R=2 V=(12/R + 5)× R ∴ 2=(12/R + 5)× R ⇒ R+5=6 R ⇒ R=1 Ω

Q. For what value of $R$ , (in ohm) the current in galvanometer is zero?

$i = \frac{12}{R + 5}$
Potential difference across $R = 2 V = \frac{12}{R + 5} \times R$
$∴ 2 = \frac{12}{R + 5} \times R$
$\Rightarrow R + 5 = 6 R$
$\Rightarrow R = 1 Ω$

Q. For what value of R , (in ohm) the current in galvanometer is zero?

i=R+512​ Potential difference across R=2V=R+512​×R ∴2=R+512​×R ⇒R+5=6R ⇒R=1Ω

Q. For what value of $R$ , (in ohm) the current in galvanometer is zero?

$i = \frac{12}{R + 5}$
Potential difference across $R = 2 V = \frac{12}{R + 5} \times R$
$∴ 2 = \frac{12}{R + 5} \times R$
$\Rightarrow R + 5 = 6 R$
$\Rightarrow R = 1 Ω$