A 4.5 nF (4.5 x 10-9 F) parallel-plate capacitor is charged to a 175 V battery. It is then disconnected from the battery and immersed in distilled water. Distilled water has a dielectric constant of (k = 80).  What is the energy of the capacitor after its immersion in water?

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A 4.5 nF (4.5 x 10-9 F) parallel-plate capacitor is charged to a 175 V battery. It is then disconnected from the battery and immersed in distilled water. Distilled water has a dielectric constant of (k = 80). 

What is the energy of the capacitor after its immersion in water? 

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