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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

NameDate

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

  1. A long straight wire carries 5 A. With μ₀ = 1.25663706127 × 10⁻⁶ N/A², what is its field 2 cm away, in μT, to 0.01, Ari?

  2. A long straight wire carries 3 A. With μ₀ = 1.25663706127 × 10⁻⁶ N/A², what is its field 1.5 cm away, in μT, to 0.01, Bo?

  3. A long straight wire carries 12 A. With μ₀ = 1.25663706127 × 10⁻⁶ N/A², what is its field 3 cm away, in μT, to 0.01, Esme?

  4. Read this first

    Paper clips lifted by a coil around an iron nail (example data)

    TurnsCurrent (A)Clips lifted
    1012
    2014
    4018
    202?

  5. Using the table, how does the number of turns change the clips lifted at 1 A, Jun?

    • Turns make no difference
    • Twice the turns, twice the clips
    • Twice the turns, half as many clips

  6. Using the table, why do the first three rows make a fair test of turns, Luz?

    • The turns stay at 20
    • The clips differ in each row
    • The current stays at 1 A

  7. A crane lifts scrap steel with an electromagnet. How does it let the steel go, Milo?

    • It adds more turns
    • It cuts the current
    • It turns the magnet over

  8. Why use an electromagnet rather than a permanent magnet for lifting, Noah?

    • It needs no electricity
    • It can be switched on and off
    • It is weaker

  9. In an electric doorbell, what pulls the striker toward the bell, Pia?

    • A spring pulling by itself
    • Static charge
    • An electromagnet

  10. A compass sits under a wire. When the current is switched on, the needle turns. What turns it, Ren?

    • Heat given off by the wire
    • Static charge
    • The current's magnetic field

  11. A bigger current flows through the wire. What happens to the needle's turn, Zee?

    • It stops turning
    • It turns farther
    • It turns less far than before
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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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