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Please show all work!! You are hanging out on earth and you have a charge (q=-4.5nC)...

Please show all work!!

You are hanging out on earth and you have a charge (q=-4.5nC) that has a mass of 6.4 grams. It is placed in a location where there are 4 different e-fields acting on it. The first is directed upward with a strength of 900N/C. The second is directed to the right with a strength of 12000N/C. The third is directed at a 30-degree above the x-axis with a strength of 7500N/C. What is the strength and direction of the fourth e-field so that the charge is held in place if released?

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