Question

For what value of R will the current in galvanometer zero?

• A. 5Ω
• B. 2Ω
• C. 7Ω
• D. 1Ω

Answer 1

Answer: (D)

1Ω

Answer 2

i =

Potential difference across R = 2 V = × R

$\therefore$ 2 = × R

⇒ R + 5 = 6 R

⇒  R = 1 Ω