Question 2

A solenoid has N turns and cross-sectional area A, and is 3.0 cm long. When a current I is sent through it, the energy stored in this solenoid is 20.0 J. Consider now a different solenoid with the same number N of turns, and the same cross section A, but of length 5.0 cm. If you send the same current I through it, the energy stored in it will be

• A. 56 J
• B. 33 J
• C. 12 J
• D. 7.2 J
• E. 5.6 J
• F. Not close to any of the above

Formula Sheet

Question 1

Question 3

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