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 - Building Confidence

NameDate

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

A 2 μC charged bead moves at 400 m/s at right angles to a 0.6 T field. What force acts on it, to 0.01 mN, Ari?
A 5 μC charged bead moves at 300 m/s at right angles to a 0.3 T field. What force acts on it, to 0.01 mN, Bo?
A 1.5 μC charged bead moves at 800 m/s at right angles to a 0.5 T field. What force acts on it, to 0.01 mN, Kira?
4.
“example data” In the diagram, which way is the force on the positive charge, Milo?
- Up the page, along its motion
- To the right
- To the left
5.
A charged bead moves straight along the field lines. What magnetic force acts on it, Noah?
- Half of qvB, pushing it forward
- The full qvB, along the field lines
- Zero, since its motion is along the field
6.
At what angle between the motion and the field is the magnetic force greatest, Pia?
- 45°
- 90°
- 0°
7.
A charged bead sits at rest in a magnetic field. What magnetic force acts on it, Ren?
- Zero, since it is not moving
- A force that starts it moving along the field
- qB, pointing along the field
8.
In the diagram, which way is the force on the wire, Tala?
- Up the page
- To the right, along the current
- Down the page
9.
In the diagram, which way is the force on the wire, Zee?
- To the right
- To the left
- Out of the page, along the field
10.
In the diagram, which way is the force on the wire, Esme?
- To the left, along the current
- Up the page
- Down the page

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

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)

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

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.

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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