Electrical Power & Heating Effect
When a potential difference is applied across a wire of resistance , it dissipates energy at a rate . If the wire is cut into two halves and these halves are connected mutually parallel across the same supply, the energy dissipation rate will become:
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Answer: (b)
- Each half: ; in parallel: .
- , so the rate becomes .
- So the answer is (b) 4W.