PHY 102 Chapter 20 Review Questions with Verified Solutions Latest Update 2024 ( Already Passed)
If you were a parallel plate capacitor manufacturer, state three ways you might make larger valued capacitors - Answers Increase plate area
Decrease separation
Increase the dielectric constant
State...
If you were a parallel plate capacitor manufacturer, state three ways you might make larger valued
capacitors - Answers Increase plate area
Decrease separation
Increase the dielectric constant
State three reasons for adding a dielectric material between the plates of a capacitor - Answers
Dielectrics do not break down (allowing electric charge to flow) as readily as air, so a higher voltage can
be applied without charge passing across the gap
A dielectric allows the plates to be placed closer together without touching thus allowing an increased
capacitance
If a dielectric fills the space between the two conductors, it increases the capacitance
After being charged from a battery, the plates of a parallel plate capacitor are moved closer together.
When they are half as far apart as originally, by how much does the stored energy change? - Answers
The capacitance doubles but charge remains the same so energy reduces to half of what it was Q^2/2C
Electric potential is a scalar quantity - Answers True
The direction of an electric field is from higher to lower potential - Answers True
When an electron moves in a direction opposite to the electric field, its potential increases but the
potential energy decreases - Answers True
When a proton moves in a direction of the electric field, its potential increases but its potential energy
decreases - Answers True
Unlike electric potential, the electric potential energy is a vector quantity - Answers False
A potential changes at the greatest rate in the direction of the gradient of the potential - Answers True
The electric potential at a point P due to a positive charge is along the direction of that charge - Answers
False
Every point on an equipotential surface is at the same potential - Answers True
Equipotential lines and electric field lines meet perpendicular to one another - Answers True
In the expression for the definition of capacitance C=Q/V, Q is the total charge on the plates of a
capacitor - Answers False
The capacitance of a parallel plate capacitor is directly proportional to its plate separation - Answers
False
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