EasyPhysicsHigh School (11–12)Electricity & Magnetism › Magnetic Effects of CurrentNumericalA-LevelAPBoard ExamIB
A straight wire 0.15 m long carries 6.5 A between the poles of a magnet…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
A straight wire m long carries A between the poles of a magnet. The field is uniform and equal to T. Find the force on the wire when it is at right angles to the field, and when it makes an angle of with the field.
Need a reminder? The key ideaShow
, or , with along the current. In a uniform field a bent wire feels the force of the straight wire between its ends, and a closed loop feels none. A wire floats when .
The worked solution
Have you tried it?
Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Step 1. At right angles. .
Step 2. At . .
Answer: N, and N.
What if the current is reversed? The size is the same, but the force points the other way.
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