Question

Shown in the figure below is a meter-bridge set up with null deflection in the galvanometer.

The value of the unknown resistor R is -

• A. 13.75 Ω
• B. 220 Ω
• C. 110 Ω
• D. 55 Ω

Answer 1

Answer: (B)

220 Ω

Answer 2

= ⇒ $\frac { 20 } { 80 }$ = ⇒ R = 220 Ω