Superconductors Have Been Discussed as a Means for Electrical Energy

question 66

Multiple Choice

Superconductors have been discussed as a means for electrical energy storage.Because they are resistanceless,a current once started in a loop would continue without loss.If a current of 1.0 × 10⁴ A were started in a huge toroidal coil of radius 1.0 km and inductance 50 H,how much electrical energy (in kWh) could be stored?

• A)300 kWh
• B)480 kWh
• C)690 kWh
• D)840 kWh

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