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The magnetic field within an air-cored solenoid is 0.8 T. If the solenoid is 40 cm long and 2 cm in diameter,

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The magnetic field within an air-cored solenoid is 0.8 T. If the solenoid is 40 cm long and 2 cm in diameter, the energy stored in its magnetic field is 

(A) 32 J 

(B) 3.2 J 

(C) 6.4 kJ 

(D) 64 kJ

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1 Answer

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by (32.9k points)

Correct option is (A) 32 J

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