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Introductory Physics Homework Help
Reversing an electron's speed in a magnetic field
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[QUOTE="TSny, post: 5484918, member: 229090"] Average acceleration is defined to be ##a_{avg} = \frac{\vec{v}_f - \vec{v}_i}{\Delta t}##. This is what I meant by average acceleration. The average force is then mass time average acceleration. OK. You are right, your friend's answer is wrong because he/she calculated the magnitude of the average force rather than the magnitude of the instantaneous force. (The question seems to be asking for the instantaneous force. However, I suppose that one could interpret the wording as asking for the average force. Then your friend would be correct!) [/QUOTE]
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Reversing an electron's speed in a magnetic field
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