Conductors and Capacitors
What is the direction of the induced electric field inside a dielectric material when it is placed in an external electric field?
In the same direction as the external field.
Perpendicular to the external field.
In the opposite direction to the external field.
The induced electric field is zero.
How does the induced electric field within a dielectric affect the total electric field strength inside the dielectric?
It increases the total electric field strength.
It decreases the total electric field strength.
It does not affect the total electric field strength.
It reverses the direction of the total electric field.
A capacitor has an original capacitance of . If a dielectric material with a dielectric constant of is inserted between the plates, what is the new capacitance?
1.33 F
4 F
7 F
12 F
What happens to the charges within a dielectric material when it is placed in an external electric field?
They move freely like electrons in a conductor.
They shift slightly, creating electric dipoles.
They are completely neutralized.
They are unaffected by the electric field.
What does the dielectric constant () represent?
The material's resistance to electric current.
The material's ability to store magnetic energy.
The ratio of the material's permittivity () to the permittivity of free space ().
The material's conductivity in an electric field.
A parallel-plate capacitor has an external electric field of . When a dielectric is inserted, an induced electric field is created such that the net electric field is reduced. If and the dielectric consta...
200 V/m
500 V/m
1000 V/m
5000 V/m
What is the effect of inserting a dielectric material between the plates of a capacitor on its capacitance?
The capacitance decreases.
The capacitance increases.
The capacitance remains the same.
The capacitance becomes zero.

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What is the primary effect of the alignment of electric dipoles within a dielectric material when placed in an external electric field?
It causes the material to become conductive.
It creates an overall polarization of the material.
It neutralizes the external electric field.
It has no effect on the material.
When a dielectric material is placed in an external electric field, how do the positive charges within the dielectric move?
Opposite to the direction of the electric field.
Perpendicular to the direction of the electric field.
In the direction of the electric field.
They do not move at all.
A dielectric material consists of both polar and nonpolar molecules. Which mechanism contributes to its polarization when placed in an external electric field?
Only stretching of polar molecules.
Only rotation of polar molecules.
Stretching or rotation of polar molecules, or inducing polarization in nonpolar molecules.
Neither stretching/rotation of polar molecules nor polarization of nonpolar molecules.