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Download Physics 202-Section 2G Worksheet 1- Electrostatic force and electric
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Transcript
Physics 202-Section 2G Worksheet 1- Electrostatic force and electric fields Formulas and Constants Force between 2 charges: ππ π πΉ = 12 2 , π = 9 × 109 π Electric field resulting from a charge: ππ πΈ= 2 π Force on a charge in an electric field: πΉ = πΈπ *Remember that forces and electric fields both have magnitudes and directions, and are treated as vector quantities. 1. Three charges (π1 , π2 , π3 ) are arranged to form a triangle. Find the following. π1 = β20 ππΆ 0.45 m π2 = +12 ππΆ 0.19 m π3 = β7 ππΆ a. Force between π1 and π2 _________ N b. Force between π2 and π3 _________ N c. Net force acting on π2 ____________ N d. Direction of net force on π2 ______________ ° south of west 2. Two metal spheres each carry charges. The sphere A has a +3 ΞΌC charge and sphere B has a -6 ΞΌC charge. When very briefly touched together and then separated, what will occur? A. the spheres will transfer electrons, the charges will equilibrate, and each sphere will possess the same charge. B. the charges will cancel and each sphere will be neutral C. some electrons will be exchanged, resulting in two positively-charged spheres. D. the charges on the spheres will not change as insufficient time was permitted allow the spheres to exchange electrons. 3. Point π΄ sits in the plane of a uniform electric field of magnitude 200 N/C that points to the right of the page. a. A charge (π1 = +2.3 ππΆ) is placed 15 cm to the right of point π΄. Find the magnitude and direction of the electric field at point π΄. 15 cm π΄ π1 200 N/C E = _____________ N/C (to the left, to the right) b. Another charge (π2 = +3.6 ππΆ) is placed 10 cm to the left of point π΄. Find the new magnitude and direction of the electric field at point π΄. 10 cm π2 π΄ 15 cm π1 200 N/C E = _____________ N/C (to the left, to the right) 5. An object of mass π1 = 0.015 ππ and charge π1 = β15 ππΆ is released from rest in a uniform electric field of magnitude 550 N/C. The object and electric field are positioned in the x-y plane, and the electric field points in the negative x-direction. Find the following. a. Net force on the object due to the electric field: ____________ N b. Magnitude of the acceleration of the object: _____________ m/s2 c. Direction of acceleration of the object: (positive x-direction, negative x-direction)