Two similar very small conducting spheres having charges 40C and -20C are at some distance apart. Now they are touched and then kept at a same initial distance. What is the ratio of the initial to the final force between them ?

Two similar very small conducting spheres having charges 40C and -20C are at some distance apart. Now they are touched and then kept at a same initial distance. What is the ratio of the initial to the final force between them ?

Principles of Physics: A Calculus-Based Text

5th Edition

ISBN:9781133104261

Author:Raymond A. Serway, John W. Jewett

Publisher:Raymond A. Serway, John W. Jewett

Chapter19: Electric Forces And Electric Fields

Section: Chapter Questions

Problem 6P

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Concept explainers

Magnetic Field Of Coaxial Cable

The word coaxial means same axis. So for a long straight cable to be coaxial, it must have concentric cylindrical shaped conductor around it. Coaxial cable (popularly called ‘coax’) has various applications ranging from current conductors to radiofrequency signal transmitters. This cable has lower emission losses and provides protection from electromagnetic interference which allows signals with less power to transmit over longer distances.For example, currents produced in the pickup of a stereo turntable generally travel to the amplifier through a coaxial cable.The self-inductance of a coaxial cable is another important characteristic, because it influences the propagation of electrical signals in the cable.

Question

Find the ratio of magnitude of forces?

Two similar very small conducting spheres having
charges 40C and -20C are at some distance apart.
Now they are touched and then kept at a same
initial distance. What is the ratio of the initial to the
final force between them ?

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