Four wires of same material, the same cross-sectional area and the same length when connected in parallel give a resistance of 25 Q. If the same four wires are connected is series the effective resistance will be________?
Correct answer: D. 400 Ω
- A. 100 Ω
- B. 200 Ω
- C. 300 Ω
- D. 400 Ω
Explanation
Four identical wires in parallel have an equivalent resistance of R/4=25 ohms, so each wire is 100 ohms. In series their resistance is 4R=400 ohms.
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