Charges and Coordinates The charges and coordinates of two charged particles hel
ID: 1705624 • Letter: C
Question
Charges and Coordinates The charges and coordinates of two charged particles held fixed in the xy plane are qA = +2.7 µC, xA = 3.5 cm, yA = 0.50 cm, and qB = -4.0 µC, xB = -2.0 cm, yB = 1.5 cm.(a) Find the magnitude and direction of the electrostatic force on qB.
1Your answer is incorrect. N
2Your answer is incorrect.° (counterclockwise from the +x axis)
(b) Where could you locate a third charge qC = +5.1 µC such that the net electrostatic force on qB is zero?
xC = 3 cm
yC = 4 cm
Section 22.8 Solving Problems Using Coulomb's Law
Explanation / Answer
a) attractive force. distance between the two charge. D=sqrt((1.5-0.5)^2+(3.5--2)^2)=5.6(cm). the angle is alpha cos alpha = (2+3.5)/5.6 so alpha=10.3(deg). F=kqA*qB/d^2=31(N). angle (x-axis) = -10.3 b)FBC is attractive too. ABC must be in a line (so that the vectors can be destructive to other). let S be distance BC. k*5.1e-6*4e-6/S^2=31 so S=0.077(m)=7.7(cm). --- so that position of C (must be on the difference side with A). is. x=xB-7.7*cos10.3=-9.6(cm). y=yB+7.7*sin10.3=2.9(cm_