Mathematics · Current Electricity
When a 20 m copper wire is connected to a 110 V mains supply, the power dissipation is W1. Now the copper wire is cut into four equal pieces and connected in parallel to the same 110 V supply, then the power dissipation is W2. Find the ratio of W1 and W2:
- 11 : 4
- 21 : 8
- 31 : 16✓
- 41 : 1
Correct answer
1 : 16
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