Monday, April 29, 2024 Text is available under the CC BY-SA 3.0 licence.

James Jeans

« All quotes from this author
 

Superficially at least the forces of electricity and magnetism seem to present the same kind of problem as gravitation. Experiment shows that two electrically charged bodies attract one another (or repel if their charges are of the same kind) with a force which conforms to the same mathematical law as the force of gravitation - both forces fall off inversely as the inverse square of the distance. The same is true of the magnetic force also; two magnetic poles attract or repel one another with a force which again follows the law of the inverse square of the distance.

 
James Jeans

» James Jeans - all quotes »



Tags: James Jeans Quotes, Authors starting by J


Similar quotes

 

Gravitational force is simple, and a thing by itself, as also are electric and magnetic forces as long as the electric and magnetic poles stand at rest. But as soon as motion comes into the picture, the whole situation is changed. Forces of new kinds come into play, for moving electric charges exert magnetic forces in addition to the electric forces they exert when at rest, while moving magnets exert electric forces in addition to the magnetic forces they exert while at rest. When the exact laws governing these intricate laws had been discovered by a great number of experimenters, Clerk Maxwell succeeded in expressing them in a mathematical form which was both simple and elegant.

 
James Jeans
 

Bohr's investigation had typified what had become a standard procedure in problems of theoretical physics. The first step was to discover the mathematical laws governing certain groups of phenomena; the second was to devise hypothetical models or pictures to interpret these laws in terms of motion or mechanism; the third was to examine in what way these models would behave in other respects, and this would lead to prediction of other phenomena-predictions which might or might not be confirmed when put to the test of experiment. For instance, Newton had explained the phenomena of gravitation in terms of a force of gravitation; a later age had seen the luminiferous ether introduced to explain the propagation of light and, subsequently, the general phenomena of electricity and magnetism; finally Bohr had introduced electronic jumps in an attempt to explain atomic spectra. In each case the models had fulfilled their primary purpose, but had failed to predict further phenomena with accuracy.

 
James Jeans
 

Electric and magnetic forces. May they live for ever, and never be forgot, if only to remind us that the science of electromagnetics, in spite of the abstract nature of its theory, involving quantities whose nature is entirely unknown at the present, is really and truly founded on the observations of real Newtonian forces, electric and magnetic respectively.

 
Oliver Heaviside
 

I protect my right to be a Catholic by preserving your right to believe as a Jew, a Protestant, or non-believer, or as anything else you choose.
We know that the price of seeking to force our beliefs on others is that they might some day force theirs on us.
This freedom is the fundamental strength of our unique experiment in government. In the complex interplay of forces and considerations that go into the making of our laws and policies, its preservation must be a pervasive and dominant concern.

 
Mario Cuomo
 

Evidently Proclus does not advocate here simply a superstition, but science; for notwithstanding that it is occult, and unknown to our scholars, who deny its possibilities, magic is still a science. It is firmly and solely based on the mysterious affinities existing between organic and inorganic bodies, the visible productions of the four kingdoms, and the invisible powers of the universe. That which science calls gravitation, the ancients and the mediaeval hermetists called magnetism, attraction, affinity. It is the universal law, which is understood by Plato and explained in Timaeus as the attraction of lesser bodies to larger ones, and of similar bodies to similar, the latter exhibiting a magnetic power rather than following the law of gravitation. The anti-Aristotelean formula that gravity causes all bodies to descend with equal rapidity, without reference to their weight, the difference being caused by some other unknown agency, would seem to point a great deal more forcibly to magnetism than to gravitation, the former attracting rather in virtue of the substance than of the weight. A thorough familiarity with the occult faculties of everything existing in nature, visible as well as invisible; their mutual relations, attractions, and repulsions; the cause of these, traced to the spiritual principle which pervades and animates all things; the ability to furnish the best conditions for this principle to manifest itself, in other words a profound and exhaustive knowledge of natural law — this was and is the basis of magic.

 
Helena Petrovna Blavatsky
© 2009–2013Quotes Privacy Policy | Contact