Question 1
Which of the following materials has the highest dielectric constant?
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air
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Mylar
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paper
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Pyrex glass
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water
Question 2
Which of the following statements is incorrect?
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Capacitance is always positive.
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The symbol for potential difference between the plates of a capacitor is

.
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Water is a polar molecule.
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When a dielectric is placed in a capacitor it serves to reduce the electric field.
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Nonpolar molecules cannot be used for dielectric material in a capacitor.