WAEC Physics 2022 Objective — Question 25
Question 25 of 50 from the West African Examinations Council (WAEC) Physics 2022 Objective paper, with the correct answer and a full explanation.
Advertisement
A galvanometer with a full scale deflection of 20 mA is converted to read 8V by connecting a 395Ω resistor in series with it. Determine the internal resistance of the galvanometer.
- A. 25Ω
- B. 5.0ΩCorrect
- C. 8.0Ω
- D. 10.0Ω
Explanation
Total resistance needed R=V/I=8/0.02=400Ω. Galvanometer resistance = 400−395 = 5.0Ω.
Advertisement
Sign up free to unlock
- Score tracking
- Practice history
- Saved questions
- Progress dashboard
- Personalized sessions
- Weak-topic breakdown
…and/or go further with premium services and No Ads.