An Air-Filled Capacitor Is Formed from Two Long Conducting Cylindrical

question 51

Multiple Choice

An air-filled capacitor is formed from two long conducting cylindrical shells that are coaxial and have radii of 48 mm and 84 mm. The electric potential of the inner conductor with respect to the outer conductor is -400 V. (k = 1/4πε₀ = 8.99 × 10⁹ N ∙ m²/C²) The energy stored in a 1.0-m length of this capacitor is closest to

• A) 8.0 μJ.
• B) 5.7 μJ.
• C) 11 μJ.
• D) 16 μJ.
• E) 22 μJ.

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