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11th grade Electric currents make magnetic fields worksheet

6 printable versionsBuilding Confidence10 questions · answer keyFree · no account

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Electric currents make magnetic fields

Grade 11 Science Worksheet - Building Confidence

NameDate

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

  1. A long straight wire's field is 40 μT at 2 cm away. With the same current, what is it 4 cm away, Ari?

  2. A long straight wire's field is 60 μT at 1 cm away. With the same current, what is it 3 cm away, Bo?

  3. A long straight wire's field is 30 μT at 3 cm away. With the same current, what is it 2 cm away, Esme?

  4. Read this first

    Use this

    Field-line diagram (example data): a straight wire carries current straight up out of the page. Circular field lines surround it, closer together near the wire. 4 compasses around the wire point along the circles, counterclockwise as seen from above.

  6. In the diagram, what shape are the field lines around the wire, Jun?

    • Straight lines out from the wire
    • Lines along the wire
    • Circles

  7. In the diagram, where is the field strongest, Kira?

    Use the picture in question 4.

    • Close to the wire
    • The same everywhere
    • Far from the wire

  8. In the diagram, the current is reversed. What do the compasses do, Luz?

    Use the picture in question 4.

    • They point at the wire
    • They stay the same
    • They turn to point clockwise

  9. A current flows into the page. Which way do the field lines circle, seen from the front, Noah?

    • They don't circle
    • Counterclockwise
    • Clockwise

  10. The current in the wire is switched off. What happens to its magnetic field, Pia?

    • It doubles
    • It stays as it was
    • It disappears

  11. More turns are wound onto a coil with the same current. What happens to its field, Tala?

    • It gets stronger
    • It gets weaker
    • It stays the same

  12. An iron nail is put inside a coil carrying a current. What happens, Zee?

    • The field disappears
    • The field gets much stronger
    • The current stops
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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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