Lesson Plan

• Describe the right‑hand rule to determine the direction of magnetic force on a straight current‑carrying conductor.
• Apply the formula F = I l B sinθ to calculate the magnitude of the force for given values.
• Analyze configurations of current and magnetic field to predict the resulting force direction.
• Identify common misconceptions related to current direction and the sine factor.

• Projector and screen
• Whiteboard and markers
• Printed worksheets with practice scenarios
• Ruler/scale and calculator
• Demonstration set‑up (wire segment, power supply, bar magnets)
• Handout of the right‑hand rule diagram

Begin with a quick visual hook showing a magnet and a current‑carrying wire. Ask students to recall how they would predict the motion of the wire, linking to prior work on magnetic fields. State that by the end of the lesson they will reliably determine both direction and magnitude of the magnetic force.

1. Do‑now (5 min): Slip‑question – “Current right, field into page – which way does the force act?” Collect responses.
2. Mini‑lecture (10 min): Review right‑hand rule and the formula F = I l B sinθ; display diagram on the projector.
3. Guided example (12 min): Solve the sample problem (0.15 m, 3 A, 0.40 T) together, emphasising the sine term.
4. Paired practice (15 min): Worksheet with three different I‑B configurations; students determine direction using the rule and calculate force magnitude.
5. Check for understanding (8 min): Exit‑ticket quiz – one direction question and one short calculation.

Summarise the three‑step process: identify I and B, apply the right‑hand rule for direction, then use the formula for magnitude. Collect exit tickets, remind students to complete the remaining worksheet questions for homework, and preview the next topic on torque in magnetic fields.