Wheatstone Bridge & Meter Bridge — A/L Physics

How do I practise Wheatstone Bridge & Meter Bridge?

1 question with a worked solution

1. In a meter bridge experiment, an unknown resistor X is placed in the left gap and a standard 15 Ω resistor is placed in the right gap. The balance point is obtained at a distance of 40 cm from the zero end (left side). What is the value of the unknown resistance X?
   1. A) 22.5 Ω
   2. B) 15 Ω
   3. C) 10 Ω
   4. D) 6.0 Ω
   Check my answer

   Correct answer: C) 10 Ω

   Using the balanced meter bridge relation: X / R_standard = l₁ / (100 - l₁). With l₁ = 40 cm, the remaining length is 100 - 40 = 60 cm. Thus: X / 15 Ω = 40 / 60 = 2 / 3 => X = (2/3) × 15 Ω = 10 Ω.

   Show worked solution

   Step 1: Formula: X / R = l₁ / (100 - l₁). Step 2: X / 15 = 40 / 60 = 2 / 3 => X = 15 × (2 / 3) = 10 Ω. Answer: 10 Ω.
   Modelled on: the A/L Physics examination pattern

Get this auto-marked

Next in the syllabus

Where does Wheatstone Bridge & Meter Bridge fit in the syllabus?

Unit 7.7 · Year 2 · Term 1