Asked by jasmine
Two identical small spherical conductors (point charges), separated by 0.6 m, carry a total charge of 200 mu or micro CC. They repel one another with a force of 120 N. (For the universal constant k use the value 8.99 times 109 N m2/C2.)
I think i am suppose to use E=kQ/r^2 . do I use this for both spheres then add them to equal 200? where does the force come in?
I think i am suppose to use E=kQ/r^2 . do I use this for both spheres then add them to equal 200? where does the force come in?
Answers
Answered by
jasmine
(a) Find the charge on each sphere.
Answered by
Damon
E is the electric field, the force on a point charge of ONE coulomb.
You can do it with E for either charge, ten multiply by the charge on the other (the target) sphere.
Normally though you would just use the Coulomb law form
F = k Q12Q2/r^2
see:
http://teacher.nsrl.rochester.edu/phy122/Lecture_Notes/Chapter22/Chapter22.html
You can do it with E for either charge, ten multiply by the charge on the other (the target) sphere.
Normally though you would just use the Coulomb law form
F = k Q12Q2/r^2
see:
http://teacher.nsrl.rochester.edu/phy122/Lecture_Notes/Chapter22/Chapter22.html
Answered by
Damon
call one charge Q1 and call Q2 = (200*10^-6 - Q1)
Answered by
sasha
Use the formula F=kQ1Q2/r^2.
Q1+Q2=200*10^-6 C
200*10^-6 C - Q1=Q2
substitute Q2 into the top formula and solve the equation.
Q1+Q2=200*10^-6 C
200*10^-6 C - Q1=Q2
substitute Q2 into the top formula and solve the equation.
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