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OpenStudy (anonymous):

Two 5.0 mm x 5.0 mm electrodes with a 0.10 mm-thick sheet of Mylar between them are attached to a 9.0 V battery. Without disconnecting the battery, the Mylar is withdrawn. (Very small spacers keep the electrode separation unchanged.) Dielectric constant for Mylar is kMylar=3.1. What is the charge before and after the Mylar is withdrawn? What is the potential difference before and after the Mylar is withdrawn? What is the electric field before and after the Mylar is withdrawn?

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