Question on: JAMB Physics - 2024
When a cell of e.m.f 3.06 V is connected, the balance of a potentiometer is 75 cm. Calculate the new balance of a cell of e.m.f 2.295 V.
A
56.26 cm
B
73.20 cm
C
77.80 cm
D
78.70 cm
Ask EduPadi AI for a detailed answer
Correct Option: A
Potential difference (emf) is directly proportional to the balancing length in a potentiometer. Set up proportion: E₁ / E₂ = L₁ / L₂
- E₁ = 3.06 V
- E₂ = 2.295 V
- L₁ = 75 cm
- L₂ = unknown
Calculate L₂: L₂ = (E₂ x L₁) / E₁ = (2.295 x 75) / 3.06 = 172.125 / 3.06 ≈ 56.25 cm
Add your answer
Please share this, thanks!
No responses