# HW7soln - Physics 21 Fall 2007 Solution to HW-7 24.30 A...

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Physics 21 Fall 2007 Solution to HW-7 24.30 A parallel plate capacitor has energy U stored in it. The separation between the plates is d _old. If the separation is decreased to d _new, (A) what is the energy stored if the capacitor is disconnected from the battery before d is changed? (B) What is the energy stored if the capacitor remains connected to the battery while d is changed? 24.38 A parallel plate capacitor has a capacitance of C when air is between the plates. The separation between the plates is d . (A) What is the maximum magnitude of charge that can be placed on each plates if the electric field in the region between the plates is not to exceed E ? (B) A dielectic with dielectric constant K is in- serted between the plates, completely filling the volume between the plates. Now what is the maximum magnitude of charge on each plate if the electric field is not to exceed the same value E ? 24.54
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