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ch17 p57 170403
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電學
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郭俊偉
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May 25, 2013, 10:47:25 AM
5/25/13
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請問積分過程的第二行為何有負號?
討論區板主
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May 28, 2013, 8:02:23 AM
5/28/13
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您好:
假設遠離球心方向為正,向心為負
q<0
電力kqQ/R^2 <0(朝向球心)
外力F要將帶電體移開
所以F跟電力方向相反
F=-kqQ/R^2
郭俊偉於 2013年5月25日星期六UTC+8下午10時47分25秒寫道:
請問積分過程的第二行為何有負號?
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