A 7.03-nC charge is located 1.66 m from a 4.58-nC point charge. (a) Find the mag

Question

A 7.03-nC charge is located 1.66 m from a 4.58-nC point charge. (a) Find the magnitude of the electrostatic force that one charge exerts on the other 05 10-8 X Your answer cannot be understood or graded. More Information N (b) Is the force attractive or repulsive? attractive repulsive Need Help? LPead -+5 points SerCP10 15.P 004 A small sphere of mass m 6.90 g and charge 91-31.2 nC is attached to the end of a string and hangs vertically as in the figure. A second charge of equal mass and charge q2--58.0 nC is located below the first charge a distance d-2.00 cm below the first charge as in the figure. My Notes Ask Yeur (a) Find the tension in the string (b) If the string can withstand a maximum tension of 0.180 N, what is the smalest value d can have before the string breaks?

Explanation / Answer

1) a) F = kq1q2/r^2

= 9*10^9*7.03*10^-9*4.58*10^-9 / 1.66^2

= 1.05*10^-7 N

b) since both are like charges .

Hence the force will be repulsive

2) Tension in the strin = Electric force + weight

T = kq1q2 / r^2 + mg

= 9*10^9*31.2*10^-9*58*10^-9 / 0.02^2 + 6.9*10^-3*9.8

= 0.108 N

b) if max tension is 0.18N

0.18 = 9*10^9*31.2*10^-9*58*10^-9 / d^2 + 6.9*10^-3*9.8

d = 0.012 m

so smallest value of can be 1.2 cm

Related Questions

Navigate

• Browse (All)
• Browse A
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.