Question: A negative charge -0.550 µC exerts an upward0.300 N force on an unknow

Question

Question: A negative charge -0.550 µC exerts an upward0.300 N force on an unknown charge0.210 m directly below it. (a) What is the unknown charge (magnitude andsign)?
(b) What are the magnitude and direction of the force that theunknown charge exerts on the -0.550 µC charge?
***please show work so i can comprehend*** Question: A negative charge -0.550 µC exerts an upward0.300 N force on an unknown charge0.210 m directly below it. (a) What is the unknown charge (magnitude andsign)?
(a) What is the unknown charge (magnitude andsign)?
(b) What are the magnitude and direction of the force that theunknown charge exerts on the -0.550 µC charge?
***please show work so i can comprehend***

Explanation / Answer

plug in the values you know
(a) 0.3N = k(-.55E-6)(Q2)/(.21)2 solving for Q2 Q2 = 0.3(.212)/(k(-.55E-5)) Q2 = -2.67E-6C = -2.67C
(b) the magnitude and direction of force applied by the secondcharge is equal in magnitude and opposite in direction of the 0.3Nforce. this is due to newtons third law that states eachaction has an equal and opposite reaction. so the force fromthe second charge will be 0.3N in the downward direction

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