# UCF PHY2054 Post Lab-Unit 01Charges and Charged Objects1. Rub a balloon on your head and stick it to the wall. And it sticks-very nice. This question isabout why, after a while, it falls off. Consider each of the following explanations. Choose thebest one.It falls because it uses up the energy you put on it when you rubbed it.b. It falls because it uses up the charge you put on it when you rubbed it.a.It falls because the energy you put on it slowly leaks off into the wall or the air.d.) It falls because the charge you put on it slowly leaks off into the wall or the air.Given your choice for part 1, would it be possible, in principle under ideal circumstances, for aballoon to stick to a wall indefinitely?C.2.How do you know two different types of charges exist? Please use your observations/evidence3.to support your reasoning.ayr.rubbing the balldeveloplen it. threfore,choige'develops an opposite chargedon the sumuluel dlarge induction.Vector Applicationswith the head there io slatie eauttaching the ball to dhe al, dhis arface of the walT bonA.B.Y-oxisY-axis7 µC0.5 m60°-X-axisХ-ахis-4 uC2 HCThree point charges of 2.00 µC, 7.00 µC, and -4.00 uC are located at the corners of an equilateraltriangle as shown above in picture A. The two on the x-axis are in fixed positions.1. In picture B, use trig and vector identities to calculate the x and y components of thedisplacement vector between the 2.00-uC charge and the 7.00-uC charge.= O.5 sin 60°=0.433 m0.5 csk0°0.25m%3D2.Draw a free-body diagram to show the electric forces exerted on the 7.00-uC charge andclearly indicate which object exerts each electric force on it, and in which direction. (Note:You are not being asked to calculate forces, but simply to draw the proper yectors)

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