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

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Energy changes when charges or magnets move in a field

Grade 11 Science Worksheet - Challenge Me

NameDate

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

  1. Like charges of 20 nC and 30 nC, let go 4 cm apart, push apart to 10 cm. With k = 8.9875 × 10⁹ N·m²/C², how many μJ become kinetic energy, Ari?

  2. Like charges of 40 nC and 40 nC, let go 4 cm apart, push apart to 8 cm. With k = 8.9875 × 10⁹ N·m²/C², how many μJ become kinetic energy, Bo?

  3. Like charges of 10 nC and 50 nC, let go 2 cm apart, push apart to 5 cm. With k = 8.9875 × 10⁹ N·m²/C², how many μJ become kinetic energy, Esme?

  4. Released magnets had 0.06 J stored. Just as they circle together they have 0.05 J of kinetic energy. Where is the rest, Jun?

    • It was destroyed
    • In sound and a little heat
    • Still stored in the magnets

  5. It takes 0.09 J of work to pull two magnets apart slowly. How much energy is stored in their field, Kira?

    • 0.045 J
    • 0.18 J
    • 0.09 J

  6. Milo says pulling a magnet off a fridge door releases energy. Agree or disagree?

    • Agree: separating attracting things frees energy
    • Agree: the pull uses up the field
    • Disagree: it stores energy in the field

  7. Noah says unlike charges lose field energy as they are pulled apart. Agree or disagree?

    • Agree: pulling apart releases it
    • Disagree: they gain field energy
    • Agree: the charges get weaker

  8. Pia says two like charges held close together store energy that is released when they are let go. Agree or disagree?

    • Disagree: they pull together when released
    • Disagree: like charges store no energy
    • Agree: they push apart and speed up

  9. A cupboard has a magnetic latch. When is field energy released, Tala?

    • When the door is pulled open
    • When the door snaps shut
    • When the door stands still

  10. In a small electric motor, what do the magnetic forces turn electrical energy into, Zee?

    • Light
    • Chemical energy in the magnets
    • Kinetic energy of the spinning part
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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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