entProblemiD-901772178offset next ) 14of31 (2) Part A Electrode 1 has charge g.-

Question

entProblemiD-901772178offset next ) 14of31 (2) Part A Electrode 1 has charge g.-1.5x10-s Cand electrode 2 has charge g-_1.5 x 10-s a The electrodes are separated by 800 m and a free electron is located 300 m under the ground haltway between electrode 1 and electrode 2. Find the magnitude of the electric force that the electrodes exert on an electron at this position (Figure 1) Express your answer to two significant figures and include the appropriate units. F Value Units Submit Provide Feedback Next >

Explanation / Answer

q1 = charge on electrode 1 = 1.5 x 10-5 C

q2 = charge on electrode 2 = 1.5 x 10-5 C

q = charge on electron = 1.6 x 10-19 C

r1 = distance from electrode 1 for the electron = 800 - 300 = 500 m

r2 = distance from electrode 2 for the electron = 300 m

net force on the electron is given as

F = k q q1/r12 + k q q2/r22 = (9 x 109) (1.6 x 10-19) (1.5 x 10-5)/(500)2 + (9 x 109) (1.5 x 10-5)(1.6 x 10-19)/(300)2

F = 3.3 x 10-19 N

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