heeeeelp 21-76 same charge, q. At equilibrium, the balls form an equilateral tri

Question

heeeeelp

21-76

same charge, q. At equilibrium, the balls form an equilateral triangle sides of length 25.0 cm in the horizontal plane. Determine q. Two point charges lie on the x-axis. It one point charge is 6.00 mu C and lies at the origin and the other is -2.00 mu C and lies at 20.0 cm, at what position must a third charge be placed to be in equilibrium? Two beads with charges q1 = q2 = +2.67 mu C are on an insulating string that hangs straight down from m2, q2 the ceiling as shown in the figure. The flower bead is fixed in place on the end of the string and has a mass m1 = 0.280 kg. The second bead slides without friction on the string. At a distance d = 0.360 m between the

Explanation / Answer

let the third charge be placed at x cm

thenn

EF=0 at this point

so

K*Q1/x^2= KQ2/(X-20)^2

so

6/x^2= 2/(x-20)^2

or 3*(x^2+400-40x)=x^2

or 2x^2-120x+1200=0

so x= 47.32 cm

so third charge be placed at x=47 cm

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