Effected Gravitational Pull
What would happen if something suddenly affected the gravitational
pull of the earth? Is gravity directly proportional to the gravitational
field as electricity is to the electrical field?
Yes, there is a gravitational field produced by the earth,
just as there are electrical fields produced by charged
objects. However, I do not know what you mean by "electricity
being directly proportional to the electrical field". Electricity
usually refers to the whole process of using electrical
fields to do things (such as transmit power down power lines).
We cannot manipulate gravity in any such way, and gravity is
only really important when you have a very large object
(such as the earth) nearby, and the only way we COULD manipulate
that would be by moving around similarly massive objects,
but throwing large moons etc. around does not seem like a
very practical technology. Maybe there is another way, but
science currently does not know of one.
Anyway, to answer the question a little more succinctly, what
a gravitational field (or an electrical field) tells you
is the FORCE that gravity (or electricity) would exert
on an object (a charged object in the case of electricity)
at the point where you measured the field. The gravitational
field is pretty much constant everywhere over earth's surface...
(except that the direction changes!)
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Update: June 2012