Electric Field And Capacitance Quiz: Test Energy Storage Concepts

11th Grade

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By Thames

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Quizzes Created: 10017 | Total Attempts: 9,652,179

| Questions: 20 | Updated: Mar 13, 2026

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1. The electric field is related to how electric potential changes with position because the field points:

Toward increasing potential

Toward decreasing potential

Randomly

Along equipotential surfaces

Concept: field points 'downhill' in potential. Electric field direction corresponds to decreasing potential for a positive test charge. This is why it is perpendicular to equipotentials.

Explanation

Concept: field points 'downhill' in potential. Electric field direction corresponds to decreasing potential for a positive test charge. This is why it is perpendicular to equipotentials.

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About This Quiz

Electric Field and Capacitance Quiz: Test Energy Storage Concepts - Quiz

This assessment focuses on electric fields and capacitance, evaluating your understanding of energy storage concepts. Key topics include the behavior of electric fields, capacitance calculations, and their applications in real-world scenarios. Engaging with this material is essential for students and professionals aiming to deepen their knowledge in physics and electrical... see moreengineering. see less

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2. Equipotential surfaces never intersect.

True

False

Concept: single-valued potential. If surfaces intersected, a point would have two different potentials at once. Potential at a point is single-valued, so equipotentials can’t cross.

Explanation

Concept: single-valued potential. If surfaces intersected, a point would have two different potentials at once. Potential at a point is single-valued, so equipotentials can’t cross.

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3. In a uniform field between parallel plates, equipotential surfaces are:

Circles

Random curves

Planes parallel to the plates

Planes perpendicular to the plates

Concept: parallel-plate geometry. Field lines go straight from one plate to the other. Equipotentials are perpendicular to field lines, so they are parallel to plates.

Explanation

Concept: parallel-plate geometry. Field lines go straight from one plate to the other. Equipotentials are perpendicular to field lines, so they are parallel to plates.

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4. A capacitor stores energy in the ______ field between its plates.

Concept: energy stored in fields. A charged capacitor creates an electric field. Energy is stored in that field configuration.

Explanation

Concept: energy stored in fields. A charged capacitor creates an electric field. Energy is stored in that field configuration.

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5. A capacitor can have a voltage across it even if no steady current is flowing.

True

False

Concept: charge separation creates voltage. Once charged, the capacitor maintains a potential difference between plates. With an open circuit, current can be zero while voltage remains.

Explanation

Concept: charge separation creates voltage. Once charged, the capacitor maintains a potential difference between plates. With an open circuit, current can be zero while voltage remains.

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6. Capacitance describes:

Charge per unit time

How much charge is stored per unit voltage

Energy per unit mass

Resistance per unit length

Concept: capacitance definition. Capacitance is (c = q/v). It measures how easily a system stores charge for a given potential difference.

Explanation

Concept: capacitance definition. Capacitance is (c = q/v). It measures how easily a system stores charge for a given potential difference.

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7. Increasing capacitance (for the same voltage) allows more charge to be stored.

True

False

Concept: (q = cv). If (v) is fixed, larger (c) means larger (q). This is a direct consequence of the capacitance definition.

Explanation

Concept: (q = cv). If (v) is fixed, larger (c) means larger (q). This is a direct consequence of the capacitance definition.

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8. The SI unit of capacitance is the:

Ohm (Ω)

Volt (v)

Farad (f)

Coulomb (c)

Concept: capacitance unit. Since (c = q/v), the unit is coulomb per volt. That unit is called the farad.

Explanation

Concept: capacitance unit. Since (c = q/v), the unit is coulomb per volt. That unit is called the farad.

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9. The relationship between charge, capacitance, and voltage is (q = c × ______).

Concept: capacitor basic equation. This equation defines capacitor behaviour in ideal form. It links stored charge to voltage across the plates.

Explanation

Concept: capacitor basic equation. This equation defines capacitor behaviour in ideal form. It links stored charge to voltage across the plates.

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10. If the voltage across a capacitor is doubled (capacitance constant), the stored charge:

Halves

Doubles

Stays the same

Becomes zero

Concept: linear relationship. From (q = cv), charge is proportional to voltage. Doubling (v) doubles (q).

Explanation

Concept: linear relationship. From (q = cv), charge is proportional to voltage. Doubling (v) doubles (q).

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11. The electric field is stronger where equipotential surfaces are closer together.

True

False

Concept: potential gradient. Close equipotentials indicate potential changes rapidly over a small distance. Rapid change corresponds to a stronger electric field.

Explanation

Concept: potential gradient. Close equipotentials indicate potential changes rapidly over a small distance. Rapid change corresponds to a stronger electric field.

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12. Which statement about capacitors is most accurate?

Capacitors create charge from nothing

Capacitors separate charge and store energy in the electric field

Capacitors always increase current forever

Capacitors eliminate voltage

Concept: capacitor role. Capacitors don’t create net charge; they separate existing charge. Work done to separate charges is stored as electric field energy.

Explanation

Concept: capacitor role. Capacitors don’t create net charge; they separate existing charge. Work done to separate charges is stored as electric field energy.

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13. A larger plate area (in parallel-plate capacitors) generally increases capacitance.

True

False

Concept: geometry and capacitance. More area allows more charge to be stored for the same field strength and voltage. This increases capacitance.

Explanation

Concept: geometry and capacitance. More area allows more charge to be stored for the same field strength and voltage. This increases capacitance.

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14. If the plate separation of a parallel-plate capacitor is increased, capacitance generally:

Increases

Decreases

Stays the same

Becomes infinite

Concept: separation effect. Greater separation reduces the electric field for a given charge distribution and reduces (c). It becomes harder to store the same charge for the same voltage.

Explanation

Concept: separation effect. Greater separation reduces the electric field for a given charge distribution and reduces (c). It becomes harder to store the same charge for the same voltage.

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15. The potential difference between capacitor plates is related to the work needed to move charge from one plate to the other.

True

False

Concept: voltage as work per charge. Voltage measures energy per charge. Charging a capacitor requires work to separate charges against electric attraction.

Explanation

Concept: voltage as work per charge. Voltage measures energy per charge. Charging a capacitor requires work to separate charges against electric attraction.

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16. In a uniform field, potential typically changes ______ with distance along the field direction.

Concept: uniform field potential profile. If the field is constant, the potential gradient is constant. A constant gradient implies a linear change in potential with distance.

Explanation

Concept: uniform field potential profile. If the field is constant, the potential gradient is constant. A constant gradient implies a linear change in potential with distance.

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17. Which is a correct energy idea for a charged capacitor?

Energy is stored in the plates only

Energy is stored in the electric field between the plates

Energy is stored as sound

Energy is stored as magnetism only

Concept: field energy storage. The separated charges create an electric field. The configuration of that field represents stored energy.

Explanation

Concept: field energy storage. The separated charges create an electric field. The configuration of that field represents stored energy.

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18. Choosing a different zero of potential (reference ground) does not change measurable voltages between two points.

True

False

Concept: reference invariance. Only differences in potential are physically meaningful. Shifting the reference adds a constant to all potentials, leaving differences unchanged.

Explanation

Concept: reference invariance. Only differences in potential are physically meaningful. Shifting the reference adds a constant to all potentials, leaving differences unchanged.

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19. An equipotential surface is important because moving charge along it:

Always increases energy

Requires no work by the electric field (ideally)

Is impossible

Always causes current

Concept: no work along equipotential. If potential is constant, (\delta v = 0), so (\delta u = q\delta v = 0). The field does no net work for motion along that surface.

Explanation

Concept: no work along equipotential. If potential is constant, (\delta v = 0), so (\delta u = q\delta v = 0). The field does no net work for motion along that surface.

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20. Electric potential provides an 'energy landscape' that helps predict how charges will naturally move (when free).

True

False

Concept: potential as landscape. Potential is like height: charges move in directions that lower their potential energy (depending on sign). This viewpoint complements force/field descriptions.

Explanation

Concept: potential as landscape. Potential is like height: charges move in directions that lower their potential energy (depending on sign). This viewpoint complements force/field descriptions.

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