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Force in field? Why isn't it constant? 
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#1
Jul613, 01:26 AM

P: 96

Distance is a key variable with fields, however, why is it, in any field(Gravitational,Electric,Magnetic) as "d" increase, F decrease substantially?
Why can't the force x, be constant all around the field. Amazingly, the force is different at each value of d, well in most cases its zero when d is a large number. 


#2
Jul613, 02:38 AM

P: 610




#3
Jul613, 02:51 AM

C. Spirit
Sci Advisor
Thanks
P: 5,661

You are thinking of specific field configurations (the Newtonian field, Coulomb field, and magnetic field due to a current wire respectively). The electric field due to an infinite charged plane is uniform, the gravitational field within the Earth is approximately uniform, the magnetic field within an infinitely long current solenoid is uniform etc.



#4
Jul613, 04:05 AM

P: 928

Force in field? Why isn't it constant?
Well...DiracPool and WannabeNewton mentioned good points...but I think I still can add sth.
As the last post says,not all fields have the same spatial behavior...and for everyone of them,you can ask why it is like this....and for all of them,there is only one answer:because of the equations governing the fields! And more or less,those equations are determined by experimental data and more fundamental theories. 


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