A polymer has a thickness of 0.5mm and an area of 0.05m2. How do you calculate the dielectric strength of the material?, C / V, V / d, V/A, d x A, In a test a polymer sheet with a thickness of 0.5mm is ruptured by 18kV. What is the dielectric strength?, 18 x 104, 36 x 106, 18 x 106, 22 x105, What happens in a material when a rupture occurs?, The material sticks to the capacitor anode, A hole appears and the capacitor stops working, The capacitor blows up, Bound electrons are forced away from the parent atoms to form a conducting path, Why does a solid insulator with a hairline crack break down at a lower voltage than the rated voltage?, An air path forms, which has a lower dielectric strength, It is brittle and will come apart, It has a higher electric field, The statement above is not true, nothing happens, A variable capacitor has semi-circular plates. It's minimum capacitance is 30 mF at 0o and maximum is 270 mF at 180o. What is the capacitance at 90o?, 120 mF, 150 mF, 150 pF, 400 mF, If a polymer film with relative permittivity of 2.5 is placed in the airgap of a variable capacitor (min of 0pF, Max 250pF), what will the new maximum capacitance be?, 625pF, 600pF, 500pF, 375pF

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