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6/03/2014 16:11 เมื่อ 6/03/2014 อ่าน 367 | ตอบ 2

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1. สนามไฟฟ้าเป็นปริมาณเวคเตอร์ ดังนั้น ต้องรวมสนามไฟฟ้าแบบเวคเตอร์
2. เวลาคำนวณไม่ต้องแทนเครื่องหมาในสูตร เราต้องการแค่ขนาดของสนามไฟฟ้าเท่านั้น ส่วนทิศทางเรารู้อยู่แล้ว

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	Sue [68.202.141.xxx] เมื่อ 11/11/2019 02:32

2

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Sue	warehouses for rent warehouses for rent warehouses for rent warehouses for rent
	Sue [68.202.141.xxx] เมื่อ 29/02/2020 11:28

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