PencilGo

Grade 11 · Science · Physics

11th grade Magnetic force on a moving charge and on a wire worksheet

6 printable versionsChallenge Me10 questions · answer keyFree · no account

Level: Building Confidence · On Level · Challenge Me

When it’s done, scan the sheet with your phone and PencilGo marks it and picks the next one. Create a free account

Version
Print

Magnetic force on a moving charge and on a wire

Grade 11 Science Worksheet - Challenge Me

NameDate

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

  1. A 20 g metal rod 0.5 m long lies across a 0.4 T field, level, at right angles. What current makes the magnetic force equal its weight, to 0.01 A, Esme?

  2. A 50 g metal rod 0.8 m long lies across a 0.2 T field, level, at right angles. What current makes the magnetic force equal its weight, to 0.01 A, Jun?

  3. A 40 g metal rod 0.4 m long lies across a 0.5 T field, level, at right angles. What current makes the magnetic force equal its weight, to 0.01 A, Kira?

  4. A student says a magnetic field speeds up any charge moving through it. Which reply fits OpenStax, Luz?

    • Yes; the force pushes the charge along its path
    • No; the force is sideways, so the speed stays the same
    • Yes; a stronger field speeds it up more

  5. A student says an electron and a proton moving the same way through a field feel forces the same way. Which reply fits OpenStax, Milo?

    • Yes; both charges feel the same force direction
    • Yes; the field pushes each one along its path
    • No; their forces point opposite ways

  6. A student says a wire lying along the field lines feels the biggest force. Which reply fits F = IlB sin θ, Noah?

    • No; a wire along the field feels zero force
    • Yes; the force is biggest along the field, where the lines guide it
    • Yes; and that force points along the wire

  7. A proton's speed doubles in the same field. What happens to the radius of its circle, by Pia's reading (OpenStax)?

    • It stays the same
    • It doubles
    • It halves

  8. The field around a moving proton doubles. What happens to the radius of its circle, by Ren's reading (OpenStax)?

    • It becomes 4 times smaller
    • It halves
    • It doubles

  9. A 25 cm wire carries 4 A at right angles to a 0.3 T field. What force acts on it, Zee?

    • 0.3 N
    • 0 N
    • 30 N

  10. A 40 cm wire carries 5 A at 60° to a 0.2 T field. About what force acts on it, Bo?

    • About 0.35 N
    • About 0.2 N
    • About 35 N
PencilGopencilgo.com

11th grade Magnetic force on a moving charge and on a wire worksheet – printable
Print: 123456

About this worksheet

Magnetic force on a moving charge and on a wire. Every version has 10 questions, and the answer key prints on the second page.

What your child will learn

  • I can find F = qvB sin θ for a moving charge and F = IlB sin θ for a wire, with q in coulombs and l in meters.
  • I can find the direction with the right-hand rule, and flip it for an electron.
  • I can explain why the magnetic force does no work, use r = mv ÷ (qB) for a circle, and find the current that lifts a rod (BIL = mg).

Standard: none (IXL parity)

Words to know

magnetic force: A sideways push on a moving charge or a current in a field

right-hand rule: Fingers along the motion, sweep to the field, thumb gives the force

sin θ: Zero when the motion is along the field, 1 at right angles

uniform circular motion: Moving in a circle at a steady speed

Common mistakes

Your child left the charge in microcoulombs. F = qvB needs q in coulombs: 1 μC = 10⁻⁶ C.

Your child used the cosine of the angle. The force uses sin θ, where θ is the angle between the motion and the field.

Your child used the rod's mass instead of its weight. The magnetic force must balance the weight, mg, with g = 9.8 m/s².

Questions parents ask

What is the most common mistake with magnetic force on a moving charge and on a wire?

Your child left the charge in microcoulombs. F = qvB needs q in coulombs: 1 μC = 10⁻⁶ C.

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.

More physics

See all Physics

Every sheet you scan goes into your child’s record: dated, marked and ready for the year-end portfolio. Homeschool records

Ready for easier practice?

Print a sheet, scan it when it’s done, and PencilGo picks the next one.

Create a free account