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Re: challenge question ..
Could we please seperate 'field' and 'energy'? That's somthing totally differnet. To Mr. Cool, yes, you do not need any energy input to maintain a 'field', neither the field outputs any power.
Re: challenge question ..
I think there is no 'input power' for an electron at all. The electron does not need to do any work to build up its electrical field. I agree that the definition of 'field' is qutie profound and I do not understand very well. But we should notice that 'force', 'energy'...
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