Two identical objects have a charge of magnitude q. If r is the distance bethween them, what should their mass be so that the objects are balanced.

Our first step in this physics problem should be to identify all of the forces that act on the objects. There are two forces here,electrical and gravitational. Since both objects have the same charge in magnitude(like charges), the electrical force should be repulsive and equal to F(el) = (k*q^2)/ r^2. 

The gravitational force, on the other hand, is always attractive and equal to F(gr) = (G*m^2)/r^2. In orde the objects to be balanced, F(el) = F(gr). Therefore, 

(kq^2)/ r^2 = (Gm^2)/r^2 

m = (square roof of (k/G) ) * q kg.

DK
Answered by Dilyana K. Physics tutor

3071 Views

See similar Physics GCSE tutors

Related Physics GCSE answers

All answers ▸

Can you explain what the flux of a light source is?


According to Newton's third law, every action has an equal and opposite reaction. Why then does a box move when I push it? Shouldn't the two opposing forces cancel out to a zero net force?


Describe how a crumple zone on a car reduces injury to the driver in a crash.


What is an atom?


We're here to help

contact us iconContact usWhatsapp logoMessage us on Whatsapptelephone icon+44 (0) 203 773 6020
Facebook logoInstagram logoLinkedIn logo

© MyTutorWeb Ltd 2013–2025

Terms & Conditions|Privacy Policy
Cookie Preferences