Question: A parallel-plate capacitor initially has Mylar between its plates and carries charge Q. A different dielectric is then inserted between the plates without changing the

A parallel-plate capacitor initially has Mylar between its plates and carries charge ±Q. A different dielectric is then inserted between the plates without changing the charge. If the energy stored in the capacitor decreases to 30% of its initial value, what is the value of k for the new dielectric?

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