A wire 0.4 m long carries 5 A in a field of 0.6 T, and it makes an angle of 60° with the field.
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
A wire long carries in a field of , and it makes an angle of with the field. What is the force on it? What is the largest force it could feel?
Need a reminder? The key ideaShow
A wire with a current in a magnetic field feels a force , where is the angle between the wire and the field. It is largest () at right angles, and zero along the field. Fleming's left-hand rule: forefinger for the field, middle finger for the current, thumb for the force.
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. The largest force. .
Step 2. At . .
Answer: ; the largest is .
Check. is close to , so the force is close to the largest.
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