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11th grade Electric currents make magnetic fields worksheet

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Electric currents make magnetic fields

Grade 11 Science Worksheet - Challenge Me

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

  1. A coil 0.1 m long has 200 turns and carries 1.5 A. With μ₀ = 1.25663706127 × 10⁻⁶ N/A², what is the field inside, in mT, to 0.01, Bo?

  2. A coil 0.5 m long has 1000 turns and carries 0.8 A. With μ₀ = 1.25663706127 × 10⁻⁶ N/A², what is the field inside, in mT, to 0.01, Esme?

  3. Seen from its right end, a coil's current flows counterclockwise. Which end is its north pole, Jun?

    • The right end
    • The left end
    • The middle

  4. The current in that coil is reversed. What happens to its poles, Kira?

    • They swap ends
    • They stay the same
    • They both become north

  5. A bar magnet's south pole is held near a coil's north end. What happens, Luz?

    • They repel
    • They attract
    • Nothing, since one is a coil

  6. Milo says moving three times farther from a long wire cuts its field to one-ninth. Agree or disagree?

    • Disagree: it drops to one-third
    • Agree: fields fall as 1 ÷ r²
    • Agree: like gravity, it's an inverse square

  7. Noah says a long wire's field 4 cm away is one-quarter of its field 2 cm away. Agree or disagree?

    • Agree: the field is gone by 4 cm
    • Agree: double the distance, one-quarter
    • Disagree: it is half

  8. A wire's current doubles, and the meter moves twice as far away. What happens to the field it reads, Ren?

    • It stays the same
    • It doubles
    • It halves

  9. A coil is rebuilt with twice the turns on twice the length, at the same current. What happens to its field, Tala?

    • It doubles
    • It stays the same
    • It is 4 times as strong

  10. A coil's current triples. What happens to the field inside it, Zee?

    • It triples
    • It is 9 times as strong
    • It stays the same
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11th grade Electric currents make magnetic fields worksheet – printable
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About this worksheet

Electric currents make magnetic fields. Every version has 10 questions, and the answer key prints on the second page.

What your child will learn

  • I can describe a straight wire's field: circles around it, strongest close to the wire. Its direction comes from the right-hand grip rule and reverses with the current.
  • I can find B = μ₀I ÷ (2πr) (about 20 × I ÷ r μT, with r in cm) and scale it as 1 ÷ r.
  • I can describe a coil: it acts like a bar magnet, and more turns, more current or an iron core make it stronger. I can find B = μ₀(N ÷ L)I inside it, and its poles from the right-hand rule.
  • I can read a coil investigation (turns, current and paper clips) and explain electromagnets, doorbells and Oersted's compass test.

Standard: HS-PS2-5

Words to know

magnetic field (B): The region around a current or magnet where magnetic forces act; in teslas

microtesla (μT): One millionth of a tesla

right-hand grip rule: Thumb along the current, fingers curl the way the field goes

solenoid: A long coil of wire

electromagnet: A coil, often around iron, that is a magnet while current flows

Common mistakes

Your child used an inverse square. A long straight wire's field falls as 1 ÷ r: twice as far, half the field.

Your child left out the 2π. The field of a long wire is μ₀I ÷ (2πr).

Your child used the number of turns, not turns per meter. Inside a coil, B = μ₀(N ÷ L)I.

Questions parents ask

What is the most common mistake with electric currents make magnetic fields?

Your child used an inverse square. A long straight wire's field falls as 1 ÷ r: twice as far, half the field.

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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