The voltage across an air-filled parallel-plate capacitor is measured to be $V_1 = 98.0$ V. When a dielectric is inserted and completely fills the space between the plates, as in the figure below, the voltage drops to $V_2 = 28.8$ V.
(a) What is the dielectric constant of the inserted material?
Can you identify the dielectric?
$\circ$ paper
$\circ$ neoprene rubber
$\circ$ bakelite
$\circ$ teflon
$\circ$ nylon
(b) If the dielectric doesn't completely fill the space between the plates, what could you conclude about the voltage across the plates?
