Physics help

Pre-College Issues High School Life
1

<p>1) When two identical ions are separated by a distance of 6.2<em>10^-10 m, the electrostatic force each exerts on the other is 5.4</em>10^-9 N. How many electron are missing from each ion?</p>

<p>2) Two identical point charges in free space are connected by a string 7.6m long. THe tension in the string is .21N. a) Find the magnitude on each of the point charges. b) Using the information in the problem given, is it possible to determine the sign of charges? Explain. c) Find the tension in the string if 1 micro c of charge is transferred from one point charge ti the other. Compare with your result from part (a).</p>

<p>3) An object with a charge of -3.6 micro c and a mass of 0.012 kg experiences an upward force, due to uniform electric field, equal in magnitude to its weight. Find the direction and magnitude of the electric field.</p>

2

<p>1) Use Coulomb’s law, keeping q in the equation, so you get F=kq^2/r^2. Whatever you get for q, divide by 1.6 x10^-19, since that would be the missing charge from each electron.</p>

<p>2a) You know that F= 0.21N, and you know R, and you know that the charges are identical. See #1, but just solve for q.
b) No. You know they must be the same sign, but you can’t determine if they’re negative or positive.
c) Basically, just solve for the force.</p>

<p>3) E= F/q, and do a free body diagram with sum of forces. Use the sign of the charge to find the direction of the electric field.</p>