Indiana Science HS-PSII-7.1
The Standard
Given the magnitude and direction of a uniform magnetic field, calculate the flux through a specified area in terms of the field magnitude and the size and orientation of the area with respect to the field.
Indiana Academic Standards for Science (2023) · Electromagnetic Induction
Teacher's field guide
What This Standard Means
What Students Need to Do
- Students draw an arrow perpendicular to a surface and find its angle with the magnetic field. They multiply field strength by area and the cosine of that angle to find magnetic flux. If a direction for the surface arrow is given, they use it to decide the sign.
What Mastery Looks Like
- A student can calculate flux in webers from a field strength, an area, and an angle. They know flux is greatest when the field crosses the surface straight on and zero when it runs along the surface.
Common Misconceptions
- Students often use the angle between the field and the surface, rather than the angle between the field and the surface's normal. They may think a field running along the surface gives the most flux.
How to Assess It
- Exit ticket: A 0.30 m² loop has a surface normal 60° from a uniform 0.40 T field. Draw the normal and calculate the flux in webers.
Lesson moves
Ways to Teach It
Give pairs cardboard rectangles and field-arrow cards; have them tilt the rectangles, draw their surface normals, and rank three positions by flux.
Ask students to sketch a loop face-on and edge-on to a field arrow, then explain which position has more flux.
Give pairs cards showing field strengths, areas, and angles; have them match each card to a calculated flux.
Show a rotating generator coil diagram and ask students to mark where its magnetic flux is greatest and where it is zero.
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Printable HS-PSII-7.1 Worksheet
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