physics
posted by John .
Im trying to study for my physics exam by doing some extra problems, however im stuck with this one. any help is much appreciated
Two tiny spheres have the same mass and carry charges of the same magnitude. The mass of each sphere is 4.62 x 106 kg. The gravitational force that each sphere exerts on the other is balanced by the electric force. Determine the charge magnitude.

Well, from experience, the charge has to be small.
gravitational force: GM^2/r^2
electrical force: kQ^2/r^2
set them equal.
Q^2=GM^2/k = you do it, then take the square root to find Q
Respond to this Question
Similar Questions

physics
Two tiny spheres have the same mass and carry charges of the same magnitude. The mass of each sphere is 3.30 106 kg. The gravitational force that each sphere exerts on the other is balanced by the electric force. (a) What algebraic … 
physics 2
1) A spherical surface completely surrounds a collection of charges. Find the electric flux through the surface if the collection consists of a single +3.93E6 C charge. 2) A plate carries a charge of 2.52μC, while a rod carries … 
Physics
1. The problem statement, all variables and given/known data A point charge is placed at each corner of a square with side length a. The charges all have the same magnitude q. Two of the charges are positive and two are negative, as … 
Physics
im trying to study for my exam by doing problems, however im stuck with this one. any help is appreciated In doing a load of clothes, a clothes drier uses 16 A of current at 240 V for 59 min. A personal computer, in contrast, uses … 
physics
trying to study but stuck with this one. Two tiny spheres have the same mass and carry charges of the same magnitude. The mass of each sphere is 4.62 x 106 kg. The gravitational force that each sphere exerts on the other is balanced … 
physics Electricity
Two tiny conducting spheres are identical and carry charges of 20.0 μC and +50.0 μC. They are separated by a distance of 2.50 cm. (a) What is the magnitude of the force that each sphere experiences, and is the force attractive … 
Physics
Two tiny conducting spheres are identical and carry charges of 19.8 µC and +54.5 µC. They are separated by a distance of 2.45 cm. (a) What is the magnitude of the force that each sphere experiences, and is the force attractive or … 
Physics
Two small aluminum spheres, each having mass 2.65×10−2 , are separated by 85.0 . How many electrons would have to be removed from one sphere and added to the other to cause an attractive force between the spheres of magnitude … 
physics
Two tiny conducting spheres are identical and carry charges of 18.1C and +47.4C. They are separated by a distance of 3.55 cm. (a) What is the magnitude of the force that each sphere experiences? 
Physics
(Someone please help me !! I don't understand this.) Two tiny conducting spheres are identical and carry charges of 27.3C and +61.0C. They are separated by a distance of 2.64 cm. (a) What is the magnitude of the force that each sphere …