Practice Questions
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When two point charges, one positive and one negative, are placed at a distance from each other, how would you describe the electric field at a point exactly midway between them?
At the midpoint, the positive charge pushes a test charge away while the negative charge pulls it toward. Other options are incorrect because It is ea...
When an electric field is applied to a conductor versus an insulator, how do the charge distributions differ in each material?
In a conductor the electrons can move freely. Other options are incorrect because The idea that insulators let charges move is a misconception; Some t...
If a spherical surface encloses a uniformly charged sphere, how does the electric field behave at points outside the sphere according to Gauss's Law?
Gauss's Law tells us that for a sphere with uniform charge, the electric field outside behaves like the field of a single point charge at the center. ...
If two positive charges, each of 2 µC, are placed 0.5 meters apart, what is the resultant electric field strength at a point located 0.25 meters from the center of the line connecting the two charges?
The electric field from a single charge is k·q/r². Other options are incorrect because This answer uses the correct field from one charge but forgets ...
Consider a closed spherical surface surrounding a non-uniformly charged insulating material. How does the electric field behave inside the surface, and what implications does this have for field lines emanating from the surface according to Gauss's Law?
When the charge inside a closed surface is not zero, Gauss's Law tells us that electric flux through the surface equals that charge. Other options are...
Which of the following statements about dielectrics in electric fields are true? (Select all that apply)
Adding a dielectric lowers the electric field inside a capacitor for a fixed voltage, so it can hold more charge, which raises its capacitance. Other ...
Dielectric materials in capacitors can be likened to a: B: fluid that alters flow in a pipe, A: filter that removes impurities from air, C: sponge that absorbs water, D: resistor that limits current flow. How do dielectric materials affect charge flow in capacitors?
A dielectric acts like a fluid that can change how water flows through a pipe. Other options are incorrect because The idea of a filter suggests the m...
How does inserting a dielectric material into a capacitor affect the charge on its plates?
When a dielectric is put inside, its molecules line up, which reduces the electric field between the plates. Other options are incorrect because It is...
Which of the following scenarios best illustrates the effect of a dielectric material on a capacitor's electric field and charge flow?
Adding a glass piece between the plates lets tiny dipole molecules inside the glass line up with the electric field. Other options are incorrect becau...
When a dielectric material is inserted into a capacitor, what is the primary effect on the electric field within the capacitor?
A dielectric is a non‑conducting material that can be polarized, meaning its internal charges shift slightly when an external field is applied. Other ...
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