Example 1 · difficulty 3/5
A potentiometer wire of length 10 m and resistance 30 Ω is connected in series with a battery of emf 5 V and internal resistance 20 Ω. The potential gradient along the potentiometer wire is:
- A. 0.5 V m⁻¹
- B. 0.2 V m⁻¹
- C. 0.75 V m⁻¹
- D. 0.3 V m⁻¹