Magnetic force on a moving charge and on a wire
Grade 11 Science Worksheet - Building Confidence

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?
In the diagram, which way is the force on the positive charge, Jun?
- To the right, along its motion
- Down the page
- Up the page
In the diagram, which way is the force on the positive charge, Luz?
Field-line diagram (example data): a uniform field points out of the page, drawn as dots. A positive charge moves to the right. Field-line diagram (example data): a uniform field points out of the page, drawn as dots. A positive charge moves to the right. uniform field: dots out of the page + positive charge moves to the right - Down the page
- Out of the page, along the field
- Up the page
“example data” In the diagram, which way is the force on the positive charge, Milo?
Field-line diagram (example data): a uniform field points into the page, drawn as × marks. A positive charge moves up the page. Field-line diagram (example data): a uniform field points into the page, drawn as × marks. A positive charge moves up the page. + moves up positive charge uniform field into the page - Up the page, along its motion
- To the right
- To the left
At what angle between the motion and the field is the magnetic force greatest, Pia?
- 45°
- 0°
- 90°
A charged bead sits at rest in a magnetic field. What magnetic force acts on it, Ren?
- Zero, since it is not moving
- qB, pointing along the field
- A force that starts it moving along the field
In the diagram, which way is the force on the wire, Tala?
Field-line diagram (example data): a uniform field points into the page, drawn as × marks. A straight wire carries current to the right. Field-line diagram (example data): a uniform field points into the page, drawn as × marks. A straight wire carries current to the right. Field-line diagram (example data) uniform field into the page current - Up the page
- To the right, along the current
- Down the page
In the diagram, which way is the force on the wire, Esme?
Field-line diagram (example data): a uniform field points into the page, drawn as × marks. A straight wire carries current to the left. Field-line diagram (example data): a uniform field points into the page, drawn as × marks. A straight wire carries current to the left. Field-line diagram (example data) uniform field points into the page times marks straight wire carries current to the left - To the left, along the current
- Down the page
- Up the page