q1_key pt.2

q1_key pt.2 - C =-720 ˆx N C(b Calculate the magnitude and...

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PHY-2054C-002, Fall 2008 Instructor: Dr. Bhattacharya Quiz #1-KEY, Tuesday, Sept 02 1. Two positive charges 5 nC and 10 nC are separated by 50 cm as shown in the accom- panying fgure. 10nC B A 10cm 25cm 25cm 5nC (a) Find the magnitude and direction o± the electric feld at the midpoint A between the charges. The electric feld From the 5nC charge is directed twoard right and From the 10 nC charge is directed toward leFt. ThereFore the net electric feld E = k p 5 × 10 - 9 0 . 25 2 - 10 × 10 - 9 0 . 25 2 P ˆ x N /
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Unformatted text preview: C =-720 ˆx N / C (b) Calculate the magnitude and direction o± the net ±orce on a negative charge -2nC located at the point B, 10 cm away ±rom the 5 nC charge. F = k p 5 × 10-9 . 1 2 + 10 × 10-9 . 6 2 P × 2 × 10-9 ˆ x N = 9055 . 55 × 10-9 ˆx N Note that the net electric feld E at the point B is directed toward leFt (-ˆ x ), but the net Force F on the-2 × 10-9 C charge is directed toward right ( ˆ x )....
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