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A solenoid having area A and length A is filled with a material having relative permeability 2. The magnetic energy stored in the solenoid is:

1. B 2 A A
2. 0 2 A B μ A
3. 0 2 2 A B μ A
4. 0 2 4 A B μ A

Correct answer: 0 2 4 A B μ A

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