Understand what a magnetic field is. Learn the definition of magnetic field lines and understand how one can detect magnetic field lines using a compass. Related to this Question Why doesn't a magnetic force ALWAYS act on a particle which moves in a magnetic field?
This differential rotation between the 660 km outer shell and the rest of the earth offers a plausible explanation for plate tectonics and for the generation of the earth's magnetic field. Simple dynamo model is proposed, which able to reproduce all of the features of the contemporary and, ...
What does this mean when dealing with banked curves: tan(theta) = (v^2)/(rg)? (i) Explain what is meant by magnetic field. (ii) Explain the right-hand rule for the magnetic force. What is elastic hysteresis? Explain how a...
A new type of slowly traveling magnetic wave discovered inside Earth may shed light on some unexplained fluctuations in the planet's magnetic field.
The magnetic compass somehow makes use of Earth's magnetic field, much the way a standard compass does. 磁罗盘在某种程度上利用的是地球磁场,差不多像标准罗盘仪那样。 But to prove this, we would have to find some kind of magnetic sensory organ in birds. And we are not sure that we have...
How does a transformer work?A transformer is based on a very simple fact about electricity: when a fluctuating electric current flows through a wire, it generates a magnetic field (an invisible pattern of magnetism) or "magnetic flux" all around it. The strength of the magnetism (which has ...
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What is the difference between hard and soft magnetic materials? Which of the following materials is likely to be the best conductor? A.iron B.sulfur C.carbon D.tin Define the term "alloy" and provide an example. Is a substance that is attracted to an external magnetic field diamagnetic or...
These are what we call eddy currents. They're electric currents generated inside a conductor by a magnetic field that can't flow away so they swirl around instead, dissipating their energy as heat. One of the interesting things about eddy currents is that they're not completely random: they...
Understanding the mechanism behind these events, especially CMEs, is of critical importance to predicting when a large eruption might cause disruptions at Earth. CMEs in particular release large clouds of high-energy charged particles and magnetic fields that stream out across the sol...