Question

A proposed design for a cardiac defibrillator contains a parallel-plate capacitor that stores 350 J of...

A proposed design for a cardiac defibrillator contains a parallel-plate capacitor that stores 350 J of electrical energy when there is a potential difference of 3800 V across the plates. The plate area is 0.010 m2 and the plates are separated by Teflon (κ = 2.0).

What is the distance between the plates, to 3 significant figures?

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Answer #1

The energy stored in a parallel plate capacitor is given by

Therefore, the capacitance of cardiac defibrillator containing parallel plate capacitor is

Now, the capacitance of a parallel plate capacitor with dielectric is related to the plate area and the distance between the plates by the relation

     

  

Hence, the distance between the plates is

  

  

Therefore. distance between the plates is

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