Efficient and Accurate Power Sources for Electromagnets: What Are My Options?

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For a reliable power source for electromagnets, consider using a DC power supply that allows for adjustable voltage settings, which can provide a constant power source without the limitations of batteries. Options like bench power supplies or programmable power supplies are recommended for their precision and durability. To measure the strength of the electromagnet accurately, alternatives to paperclips include using a gaussmeter or a digital scale to gauge the weight of attracted objects. These tools can provide more precise measurements of magnetic strength. Exploring these options will enhance the performance and reliability of your electromagnet setup.
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Homework Statement



What can I purchase so that I have a constant voltage that is cheap for my electromagnet and you can adjust to how many volts I want? Batteries will run out of power and not give good results. Also is there another easy way to precisely meaure the strength of the electromagnet other than using paperclips?


Homework Equations


none


The Attempt at a Solution


I don't know.
 
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What I want is a power source other than batteries that won't run out of energy because once the batteries lose power, my results will be wrong.
 
Why won't anyone help me!
 
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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