[題目] 電學-電容 兩題
[領域] 電學－電容
[來源] physics for scientists and engineers 2e (randall d. knight)
課本習題
[題目] 1. Two 15-cm-diameter metal disks separated by a 0.70-mm-thick piece of
Pyrex glass are charged to a potential difference of 1700V .
(Dielectric constant of the Pyrex glass is 4.7 .)
a.What is the surface charge density on the disks?
b.What is the surface charge density on the glass?
2. Two 5mm ×5mm electrodes with a 0.10-ｍｍ-thick sheet of Mylar
between them are attached to a 9.0V battery. Without disconnecting
the battery, the Mylar is withdrawn. (Very small spacers keep the
electrode separation unchanged.) Dielectric constant for Mylar is 3.1
a.What is the charge before and after the Mylar is withdrawn?
b.What is the potential difference before and after the Mylar is
withdrawn?
c.What is the electric field before and after the Mylar is withdrawn?
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