Electric Potential Energy Quiz: Test Energy In Electric Fields

10th Grade

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Ekaterina Yukhnovich, PhD |

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Ekaterina V. is a physicist and mathematics expert with a PhD in Physics and Mathematics and extensive experience working with advanced secondary and undergraduate-level content. She specializes in combinatorics, applied mathematics, and scientific writing, with a strong focus on accuracy and academic rigor.

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| Questions: 20 | Updated: Mar 13, 2026

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1. If a charge is doubled and the potential difference is the same, the energy change (Δu) is:

Halved

Doubled

Unchanged

Zero

Concept: linear dependence on charge. From (Δu = qΔv), doubling (q) doubles the energy change. Potential difference is independent of test charge size.

Explanation

Concept: linear dependence on charge. From (Δu = qΔv), doubling (q) doubles the energy change. Potential difference is independent of test charge size.

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About This Quiz

Electric Potential Energy Quiz: Test Energy In Electric Fields - Quiz

This assessment focuses on electric potential energy and its role in electric fields. It evaluates understanding of key concepts such as charge interactions, energy conversion, and field dynamics. This knowledge is essential for students and professionals in physics and engineering, providing a solid foundation for further studies in electromagnetism.

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2. A potential difference can exist even in open space with no wire, such as between charged plates.

True

False

Concept: voltage without conduction. Potential difference is a property of the electric field configuration. It doesn’t require a conducting path, only separated charges.

Explanation

Concept: voltage without conduction. Potential difference is a property of the electric field configuration. It doesn’t require a conducting path, only separated charges.

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3. The unit j/c is equivalent to:

Ampere

Ohm

Volt

Watt

Concept: unit equivalence. Voltage is defined as energy per charge. Therefore j/c equals volt.

Explanation

Concept: unit equivalence. Voltage is defined as energy per charge. Therefore j/c equals volt.

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4. Electric potential energy depends on both the charge and the potential: (u = qv).

True

False

Concept: distinguishing u and v. Potential is a property of location/field. Potential energy also depends on what charge you place there.

Explanation

Concept: distinguishing u and v. Potential is a property of location/field. Potential energy also depends on what charge you place there.

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5. For a positive charge, moving in the direction of the electric field generally moves toward ______ potential.

Concept: field points 'downhill' in potential. Electric field points in the direction of decreasing potential. Positive charges naturally move 'down' potential if free to move.

Explanation

Concept: field points 'downhill' in potential. Electric field points in the direction of decreasing potential. Positive charges naturally move 'down' potential if free to move.

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6. Which statement is most accurate?

Electric potential tells you the direction of force directly

Electric field tells direction; potential tells energy per charge

Potential is a vector; field is a scalar

Potential is measured in amperes

Concept: roles of v and e. Potential is scalar energy-per-charge, while the field is a directional push per charge. They’re linked but represent different information.

Explanation

Concept: roles of v and e. Potential is scalar energy-per-charge, while the field is a directional push per charge. They’re linked but represent different information.

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7. If (Δv = 0) between two points, then for any charge (q), (Δu) is:

Maximum

Depends on mass

Zero

Infinite

Concept: zero potential difference. With (Δu = qΔv), if (Δv=0) then (Δu=0). No net electric potential energy change occurs.

Explanation

Concept: zero potential difference. With (Δu = qΔv), if (Δv=0) then (Δu=0). No net electric potential energy change occurs.

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8. Potential difference is more fundamental to circuits than absolute potential, because only differences affect energy transfer.

True

False

Concept: differences drive effects. You can choose a reference 'ground' anywhere. Physical outcomes depend on differences, not absolute values.

Explanation

Concept: differences drive effects. You can choose a reference 'ground' anywhere. Physical outcomes depend on differences, not absolute values.

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9. Electric potential energy is energy a charge has because of its:

Temperature only

Position in an electric field

Colour

Mass alone

Concept: potential energy from position. Like gravitational potential energy depends on height, electric potential energy depends on location relative to charges/fields. Changes in position can change this energy.

Explanation

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10. Electric potential (v) is potential energy per unit charge.

True

False

Concept: relationship (v = u/q). Potential is the 'per-charge' version of potential energy. This helps separate field properties from the particular test charge used.

Explanation

Concept: relationship (v = u/q). Potential is the 'per-charge' version of potential energy. This helps separate field properties from the particular test charge used.

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11. If a positive charge moves to a lower electric potential, its electric potential energy generally:

Increases

Decreases

Stays the same

Becomes undefined

Concept: positive charge 'downhill.' For a positive charge, lower potential means lower potential energy because (u = qv). Energy can be released to other forms.

Explanation

Concept: positive charge 'downhill.' For a positive charge, lower potential means lower potential energy because (u = qv). Energy can be released to other forms.

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12. The work done by the electric field can be related to the decrease in electric potential ______.

Concept: work-energy connection. If the field does positive work, potential energy decreases. This is similar to gravity doing work when an object falls.

Explanation

Concept: work-energy connection. If the field does positive work, potential energy decreases. This is similar to gravity doing work when an object falls.

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13. A negative charge moving to lower potential increases its potential energy (because q is negative).

True

False

Concept: sign matters in (u=qv). For negative (q), decreasing (v) makes (u) less negative or more positive, which is an increase. This is why electron motion can be opposite to field direction.

Explanation

Concept: sign matters in (u=qv). For negative (q), decreasing (v) makes (u) less negative or more positive, which is an increase. This is why electron motion can be opposite to field direction.

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14. The direction of the electric field points in the direction of:

Force on a negative test charge

Force on a positive test charge

Highest resistance

Highest current

Concept: field direction convention. By definition, electric field direction is the direction a positive test charge would be pushed. Negative charges feel force in the opposite direction.

Explanation

Concept: field direction convention. By definition, electric field direction is the direction a positive test charge would be pushed. Negative charges feel force in the opposite direction.

Submit

15. If 5 j of work is done moving 1 c of charge between two points, the potential difference is:

0.2 v

1 v

5 v

10 v

Concept: work per charge. Potential difference is energy (or work) per charge. (v = w/q = 5/1 = 5) v.

Explanation

Concept: work per charge. Potential difference is energy (or work) per charge. (v = w/q = 5/1 = 5) v.

Submit

16. Electric potential is a scalar quantity (it has magnitude but no direction).

True

False

Concept: scalar vs vector. Potential is a number at each point relative to a reference. The electric field is a vector, related to how potential changes in space.

Explanation

Concept: scalar vs vector. Potential is a number at each point relative to a reference. The electric field is a vector, related to how potential changes in space.

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17. Equipotential surfaces are surfaces where:

The electric field is always maximum

The electric potential is the same everywhere on the surface

Charge must flow along them

Current is infinite

Concept: equipotential meaning. If potential is constant, moving along the surface requires no work per charge. Equipotentials help visualize potential landscapes.

Explanation

Concept: equipotential meaning. If potential is constant, moving along the surface requires no work per charge. Equipotentials help visualize potential landscapes.

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18. Moving a charge along an equipotential surface requires (ideally) no work by the electric field.

True

False

Concept: no potential change. Work by the field depends on change in potential energy. If potential doesn’t change, there’s no change in potential energy due to position.

Explanation

Concept: no potential change. Work by the field depends on change in potential energy. If potential doesn’t change, there’s no change in potential energy due to position.

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19. The electric field is always perpendicular to equipotential surfaces because:

Light is polarized

Otherwise there would be a component that would move charge along the equipotential

Voltage has units of watts

Current must be zero

Concept: field–equipotential relationship. If the field had a component along an equipotential, it would do work moving a charge along it, changing potential. Perpendicular alignment prevents that.

Explanation

Concept: field–equipotential relationship. If the field had a component along an equipotential, it would do work moving a charge along it, changing potential. Perpendicular alignment prevents that.

Submit

20. The relationship between potential difference and energy is (Δu = qΔ ______ ).

Concept: potential energy change. Potential energy change equals charge times potential difference. This is the electric analogue of (Δu = mgΔh).

Explanation

Concept: potential energy change. Potential energy change equals charge times potential difference. This is the electric analogue of (Δu = mgΔh).

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All (20)
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Answered ()

If a charge is doubled and the potential difference is the same, the...

A potential difference can exist even in open space with no wire, such...

The unit j/c is equivalent to:

Electric potential energy depends on both the charge and the...

For a positive charge, moving in the direction of the electric field...

Which statement is most accurate?

If (Δv = 0) between two points, then for any charge (q), (Δu) is:

Potential difference is more fundamental to circuits than absolute...

Electric potential energy is energy a charge has because of its:

Electric potential (v) is potential energy per unit charge.

If a positive charge moves to a lower electric potential, its electric...

The work done by the electric field can be related to the decrease in...

A negative charge moving to lower potential increases its potential...

The direction of the electric field points in the direction of:

If 5 j of work is done moving 1 c of charge between two points, the...

Electric potential is a scalar quantity (it has magnitude but no...

Equipotential surfaces are surfaces where:

Moving a charge along an equipotential surface requires (ideally) no...

The electric field is always perpendicular to equipotential surfaces...

The relationship between potential difference and energy is (Δu = qΔ...

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