Two point charges are placed on the x axis. A charge of qA = +1.76 μC is placed at x = 0 and a charge of qB = -1.26 μC is placed at x = d.?
2017-02-08 6:11 am
When a third point charge qC is placed at x = 2d, the electric force on the charge at x = 0 reverses its direction, but its magnitude is 0.452 times its original magnitude. What is qC?
回答 (1)
2017-02-09 12:58 am
✔ 最佳答案
qC must be positive in order to repel qA, and so0 = 1.452*k*qA*qB/d² + k*qA*qC/(2d)²
in order to cancel the effect of qB on qA. k, qA and d² cancel:
-1.452*qB = qC / 4
qC = 4 * 1.452 * 1.26µC = 7.32 µC
Hope this helps!
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