Electric/Magnetic Field Technologies

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Various technologies utilize electric and magnetic fields, including common devices like toasters, loudspeakers, and MRIs. Additional examples include photocopiers, electric guitars, and electronic stud finders, which also rely on these principles. Many resources are available online to explore how these technologies function. The discussion emphasizes the interest in simple, everyday applications of electric and magnetic field technologies. Understanding these devices can enhance knowledge of their practical uses in daily life.
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What are different technologies that use electric and/or magnetic field? I already know some such as a toaster, loudspeaker, and MRI, but can someone suggest to me some more? Preferably, I am looking for simple technologies, such as the toaster.
 
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Hi temaire,

temaire said:
What are different technologies that use electric and/or magnetic field? I already know some such as a toaster, loudspeaker, and MRI, but can someone suggest to me some more? Preferably, I am looking for simple technologies, such as the toaster.

I'm not sure if these are the kind of examples you are looking for, but you might want to consider photocopiers, electric guitars, and electronic stud finders. There should be plenty of sites on the web giving details of how they work if that is needed.
 
Thread 'Variable mass system : water sprayed into a moving container'

Thread 'Variable mass system : water sprayed into a moving container'

Starting with the mass considerations #m(t)# is mass of water #M_{c}# mass of container and #M(t)# mass of total system $$M(t) = M_{C} + m(t)$$ $$\Rightarrow \frac{dM(t)}{dt} = \frac{dm(t)}{dt}$$ $$P_i = Mv + u \, dm$$ $$P_f = (M + dm)(v + dv)$$ $$\Delta P = M \, dv + (v - u) \, dm$$ $$F = \frac{dP}{dt} = M \frac{dv}{dt} + (v - u) \frac{dm}{dt}$$ $$F = u \frac{dm}{dt} = \rho A u^2$$ from conservation of momentum , the cannon recoils with the same force which it applies. $$\quad \frac{dm}{dt}...
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