Grade 11 · Science · Physics

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

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Magnetic force on a moving charge and on a wire

Grade 11 Science Worksheet

NameDate

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

A 3 μC bead moves at 400 m/s at 30° to a 0.5 T field. What force acts on it, to 0.01 mN, Bo?
A 4 μC bead moves at 250 m/s at 60° to a 0.8 T field. What force acts on it, to 0.01 mN, Esme?
3.
Field-line diagram (example data): a uniform field points into the page, drawn as × marks. In the diagram, which way is the force on the electron, Kira?
- Up the page
- Down the page
- Into the page, along the field
4.
In the diagram, which way is the force on the electron, Luz?
- Down the page
- Up the page
- To the right, along its motion
5.
In the diagram, which way is the force on the electron, Milo?
- Up the page, along its motion
- To the right
- To the left
Read this first
Use this
Table (example data), charged beads moving at right angles to a field, with columns bead, charge (μC), speed (m/s) and field (T): A, 2, 100, 0.5; B, 4, 100, 0.5; C, 2, 300, 0.5; D, 2, 100, 1.0.
6.
Using the table, which bead feels the largest force, Noah?
- Bead B, with the most charge
- Bead D, in the strongest field
- Bead C, at 0.3 mN
7.
Using the table, how does bead D's force compare with bead A's, Pia?
- D's force is half A's
- D's force is twice A's
- D's force is 4 times A's
8.
Using the table, which two beads feel equal forces, Ren?
- Beads B and D, at 0.2 mN each
- Beads C and D, at 0.3 mN each
- Beads A and C, at 0.1 mN each
9.
Why does a magnetic force do no work on a moving charge, by Zee's reading (OpenStax)?
- It acts along the velocity, adding energy
- It is always at right angles to the velocity
- It is too small to matter
10.
What path does a charge follow moving at right angles to a uniform field, by Ari's reading (OpenStax)?
- A straight line along the field
- A circle at a steady speed
- A straight line that speeds up

11th grade Magnetic force on a moving charge and on a wire worksheet – printable — Print: 1 2 3 4 5 6

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.

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