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Pjpic
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If fields fill all of space, how do they have room to move? Those tile games we had as kids always required one empty space to slide the tile into.
Dale said:They don't move. For example, the E field has a magnitude and a direction at each point in space, and that magnitude and direction can change over time, but it does not have a velocity at any point.
I have no idea what would possibly give you the idea that empty space is necessary for change to occur. It seems like such a bizarre connection, how can you possibly justify it?Pjpic said:How can something change if there's no empty space (room to grow you might say)? I
Dale said:I have no idea what would possibly give you the idea that empty space is necessary for change to occur. It seems like such a bizarre connection, how can you possibly justify it?
So what? Changing the arrangement is obviously not the only thing that could change. You could change an egg's temperature or pressure or color or hardness or smoothness or shape or any number of other changes that would be changes without requiring empty space and would be possible with all 12 eggs in place. The idea that the only possible change is change which requires empty space is so wrong I don't know where to begin.Pjpic said:If you have 12 eggs you can't change the arrangement in the carton, but if you only have 11 (one empty space) you can arrange the eggs in 12 different ways.
jtbell said:Suppose a certain point in space has, at a certain time, an electric field E = 10 V/m northward, and a nearby point has E = 0 at the same time; then a bit later, the first point has E = 5 V/m northward and the second point has E = 10 V/m northward. This doesn't mean the 10 V/m has literally "moved" from the first point to the second point. The field has simply changed its value at both points.
Fields are physical quantities that exist at every point in space. They are invisible and intangible, but they interact with matter to create observable effects. Examples of fields include gravitational, electric, and magnetic fields.
Fields do not take up physical space like matter does. Instead, they exist in the space between matter. So while fields do fill all of space, there is still empty space between particles and objects.
Fields do not move in the traditional sense. They can change in strength or direction, but they do not physically move like objects do. Additionally, fields can overlap and interact with each other, giving the appearance of movement.
The movement of fields is governed by the laws of physics, so there are limitations to how they can move. For example, electromagnetic fields can only move at the speed of light. Additionally, the movement of fields can be affected by the presence of matter or other fields.
Scientists use various instruments and techniques to study and measure the movement of fields. For example, they can use a magnetometer to measure the strength and direction of a magnetic field. They can also use mathematical equations and computer simulations to model and predict the movement of fields.