- #1
t1mm3h
- 7
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Hello, I have started reading a beginners book (from the "stop faking it" series) on electricity and magnetism. Its supplied with funny little experiments to help me understand the topic. But I have trouble understanding the intimate relationship between electricity and magnetism. I believe I understand the model of atoms, protons and electrons and how electrons behave.
I'll try to show part of the picture I have gained now: a negatively charged object (let's say a rubbed balloon) can induce a charge in another object because the electrons repel the electrons in another object and attract the protons. As a result, the distance between the electrons of the balloon and the protons of the other object is smaller and they attract each other. So I get the topics of charges, electrons' tendency to move and make objects neutral, and electric fields as a result of charging an object.
Now when it comes to magnetism I see how bar magnets interact in the sense that the magnetic force tends to "line them up". Also I took the point that electrons themselves are like tiny magnets. When a coil is connected to a battery and wrapped around, for example a screw, it creates a bigger magnetic field and leaves the screw magnetized for a while.
Now what I do not understand is when you have a coil of wire and you move a magnet in and out, a current starts to flow. Is the magnet inducing magnetism in the coil of wire? So the electrons "want to" line up with the magnetic field of the magnet, and that's why they start flowing and create current?
I also do not understand this sentence in the book I am reading: "A changing magnetic field generates an electric field". I see a magnetic field a result of a charged object (like the balloon has a magnetic field around it).
Some help on clearing this up would be great!
I'll try to show part of the picture I have gained now: a negatively charged object (let's say a rubbed balloon) can induce a charge in another object because the electrons repel the electrons in another object and attract the protons. As a result, the distance between the electrons of the balloon and the protons of the other object is smaller and they attract each other. So I get the topics of charges, electrons' tendency to move and make objects neutral, and electric fields as a result of charging an object.
Now when it comes to magnetism I see how bar magnets interact in the sense that the magnetic force tends to "line them up". Also I took the point that electrons themselves are like tiny magnets. When a coil is connected to a battery and wrapped around, for example a screw, it creates a bigger magnetic field and leaves the screw magnetized for a while.
Now what I do not understand is when you have a coil of wire and you move a magnet in and out, a current starts to flow. Is the magnet inducing magnetism in the coil of wire? So the electrons "want to" line up with the magnetic field of the magnet, and that's why they start flowing and create current?
I also do not understand this sentence in the book I am reading: "A changing magnetic field generates an electric field". I see a magnetic field a result of a charged object (like the balloon has a magnetic field around it).
Some help on clearing this up would be great!