Jinwon
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If there are 2 currents of equal magnitude going in the same direction that have a distance d apart, do their magnetic fields add up or cancel out?
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Moonbow
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series or parallel
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Jinwon
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(Original post by Moonbow)
series or parallel
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I’m confused about 4a
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Moonbow
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Maybe Q for (i) as the magnetic field is strongest in the middle
I think s for second
not sure for last...
So so sorry if its A level, I haven't got there yet

Wish the best of luck!
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cba2thinkofauser
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(Original post by Jinwon)
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I’m confused about 4a
Wouldnt the magnetic field be strongest at Q? Since the wire is coming out of the paper and if you use the right hand rule, you’d find that the magnetic field lines are going in the same direction. This means that they would ATTRACT. The magnetic field lines would overlap and create a maximum.
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Jinwon
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(Original post by cba2thinkofauser)
Wouldnt the magnetic field be strongest at Q? Since the wire is coming out of the paper and if you use the right hand rule, you’d find that the magnetic field lines are going in the same direction. This means that they would ATTRACT. The magnetic field lines would overlap and create a maximum.
Yeah, I’m a bit confused as to why they would create a maximum though. Why wouldn’t they cancel?
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cba2thinkofauser
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The magnetic field lines where they overlap add up. So surely if the magnetic field is going in the same direction, it should maximise. Btw If you’re doing A Level Physics, it’s kind of like the concept of superposition of waves.
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Jinwon
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(Original post by cba2thinkofauser)
The magnetic field lines where they overlap add up. So surely if the magnetic field is going in the same direction, it should maximise. Btw If you’re doing A Level Physics, it’s kind of like the concept of superposition of waves.
So surely if both currents are coming out of the page, at that point in the middle, one would be travelling counter clockwise and the other would be clockwise. Therefore they would cancel?
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cba2thinkofauser
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(Original post by Jinwon)
So surely if both currents are coming out of the page, at that point in the middle, one would be travelling counter clockwise and the other would be clockwise. Therefore they would cancel?
You’re right in saying that both currents are coming out of the page, but actually both magnetic fields are travelling anticlockwise because you use the right hand rule for both wires.
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