Question by questionable. ☺: Magnetism?
Hello, I’m studying about magnetism and I don’t quite understand some of the questions and I was wondering if someone could explain them to me?
Thanks!
1. Why does a current meter move when a magnet passes by a wire connected to it?
2. Why are some magnets stronger than others?
3. Why do magnets become weaker when struck?
Thanks to all who help :]
Best answer:
Answer by johnnyangelforyou
i have a question myself? have you asked your inner voice? do you ever rely on intuition? if you were struck, wouldn’t your integrity be adulterated? the force is the same; the variables that determine a mega magnet are laws of polarity, volume and density, if your studying magnetism, why dont you experiment yourself? nothing like finding out the answer on your own, because these points are worthless, so is this answer
Give your answer to this question below!
1. This is due to the phenomenon described by Faraday’s Law. EMF (electromotive force) measured in Volts are induced when a close loop experiences fluctuating magnetic field. When a magnet passes by a wire (closed loop wire, when connected to the current meter, it forms a close loop), a voltage is created. As soon as there is voltage, electrons are moving, hence there is a current. Therefore, a current meter would move.
2 and 3. Strong and weak magnets- there are if i am not mistaken 2 major types of magnets. One that is natural and the other produced. I am not very able to explain the natural one but you may look for it in Wikipedia, the 2nd one is made by passing a strong magnetic field through a material (typically made of iron), and the atoms or molecules (depending on the chemical make up) will allign themselves (each molecule has its own magnetic field and characteristic) to form a rather permanent magnet. The degree of allignment given by the magnetic force applied on it will yield different strengths.
And when you strike it, drop it or shake it (with shocks), the atoms or molecules are shaken and loses the allignment, therefore loses its strength …i.e. becomes weaker.
Hope this helps!
1. Due to the fact that the magnetic field of the magnet is intersecting the wire, whenever this happens, a current is induced on the wire. This is electromagnetic induction
2. Some magnets are hard magnetic materials, and some are soft magnetic materials,
the hard materials do not easily lose their magnetism so they have stronger magnetic fields EG. steel, but the soft ones do, they are temporary magnets whose magnetism is weak EG. iron. Size also has an effect, the bigger the magnet, the stronger the magnetic field.
Materials become magnetic when their atomic magnets line up. The atoms in a material become magnetic due to oscillations and energy changes between their electrons, they become ‘atomic magnets’. When all these tiny magnets withn the material line up, the whole material becomes magnetic. Now when you hammer a magnet, you throw the atomic magnets out of line, and the material loses its magnetism.
Magnetism is witchcraft.