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11th grade Energy changes when charges or magnets move in a field worksheet

6 printable versionsBuilding Confidence10 questions · answer keyFree · no account

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Energy changes when charges or magnets move in a field

Grade 11 Science Worksheet - Building Confidence

NameDate

Circle the best answer, or write your answer on the line.

  1. An average pull of 2 N separates two attracting magnets by 0.05 m. How much energy is stored in their field, Ari?

  2. An average pull of 0.8 N separates two attracting magnets by 0.03 m. How much energy is stored in their field, Bo?

  3. An average pull of 4.5 N separates two attracting magnets by 0.02 m. How much energy is stored in their field, Esme?

  4. Read this first

    Use this

    Energy bar chart (example data), one bar per energy store, height in J. Touching: field energy 0 J; kinetic 0 J. Pulled 4 cm apart and held: field energy 0.06 J; kinetic 0 J. Let go, just before they meet: field energy 0 J; kinetic 0.06 J. Two magnets attract, north pole facing south pole; field lines run from the north pole to the south pole between them.

  5. In the energy bar chart, how much energy is stored once the magnets are pulled 4 cm apart, Jun?

    • 0.06 J
    • 0.24 J
    • 0 J

  6. In the energy bar chart, where does the stored energy go after the magnets are let go, Kira?

    • Into more field energy
    • It disappears
    • Into the magnets' kinetic energy

  7. In the energy bar chart, where did the stored field energy come from, Luz?

    • Heat from the room
    • The magnets' weight
    • The work done pulling them apart

  8. Two attracting magnets are let go and snap together. What happens to their field energy, Noah?

    • It stays the same
    • It is released
    • It increases, since they pull harder

  9. Two magnets are pushed together with north facing north. What happens to their field energy, Pia?

    • It increases
    • It is released
    • It drops to zero

  10. Near a magnet's poles, the field lines are crowded together. What does that show, Tala?

    • There is no field there
    • The field is strongest there
    • The field is weakest there

  11. Which way do electric field lines run between a positive and a negative charge, Zee?

    • In circles around each charge
    • From negative to positive
    • From positive to negative
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11th grade Energy changes when charges or magnets move in a field worksheet – printable
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About this worksheet

Energy changes when charges or magnets move in a field. Every version has 10 questions, and the answer key prints on the second page.

What your child will learn

  • I can explain that moving against a field force stores field energy: pulling attracting magnets or unlike charges apart, or pushing repelling ones together. Letting go releases it.
  • I can find stored energy from work, W = F × d, and for two charges, U = kq₁q₂ ÷ r (in μJ with nC and cm). I can find the energy released as like charges fly apart, U at the start − U at the end.
  • I can read field lines (north to south outside a magnet; + to − for charges; crowded lines mean a strong field).
  • I can account for energy: field energy becomes kinetic energy, sound and heat. Charges speed up between plates. Fridge magnets, compasses, latches, capacitors and motors are examples.

Standard: HS-PS3-5

Words to know

field energy: Energy stored by the arrangement of charges or magnets

field line: A line showing the direction of the force a field gives

electric potential energy: Field energy of charges: U = kq₁q₂ ÷ r

microjoule (μJ): One millionth of a joule

capacitor: A device that stores energy in an electric field between plates

Common mistakes

Your child added the force and the distance. Work, and so stored energy, is force × distance.

Your child squared the distance. The force goes as 1 ÷ r², but the stored energy goes as 1 ÷ r.

Your child gave the starting energy only. The energy released is the start energy minus what is still stored at the end.

Questions parents ask

What is the most common mistake with energy changes when charges or magnets move in a field?

Your child added the force and the distance. Work, and so stored energy, is force × distance.

Are these 11th grade science worksheets free to print?

Yes. All 6 printable versions at each level are free to print, with the answer key, and no account is needed.

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