gabba gabba hey
14th August 2008 - 02:53 AM
QUOTE (DavidD+Jul 6 2008, 04:33 PM)
So there is charged ball, say with negative charge (like electron). This ball charge say is 1 Coloumb and mass 1 kg. This charged ball rotates about his axis with speed 1000 m/s. What will be strenght of magnetic field? And where will be North pole and where - South pole?
My assumption is that in center there will be South pole and closer to surface and on surface there will be North pole. Right?
Say this axis is on Earth and rotates in same direction in which clock going...(this is actauly don't interesting for, but rather where will be poles, what shape...)
My thinking direction is such: there is angular speed aceleration and thus it's like from center to surface charge moving. And also I would like to ask, does such rotating ball will radiate electromagnetic waves (becouse of icentric accelration)?
The strength of the magnetic field would depend on the material the ball is made of, and more specifically how the charge is distributed throughout the ball. For example, the ball could be made of a very good conductor like copper, in which case the charge would be evenly distributed along the surface of the ball and the field would be easy to calculate.
As for the location of the poles, if the ball is assumed to be spherical, the only information u need to provide is which direction it spins. If it is spinning counterclockwise, The north pole will be at the top of the ball (one end of the axis) and the south pole will be at the bottom (the other end of the axis) and vice versa if it spins clockwise.
DavidD
14th August 2008 - 05:29 AM
QUOTE (gabba gabba hey+Aug 14 2008, 02:53 AM)
The strength of the magnetic field would depend on the material the ball is made of, and more specifically how the charge is distributed throughout the ball. For example, the ball could be made of a very good conductor like copper, in which case the charge would be evenly distributed along the surface of the ball and the field would be easy to calculate.
As for the location of the poles, if the ball is assumed to be spherical, the only information u need to provide is which direction it spins. If it is spinning counterclockwise, The north pole will be at the top of the ball (one end of the axis) and the south pole will be at the bottom (the other end of the axis) and vice versa if it spins clockwise.
Yeah, I ask this when don't know about magnetism good... Magnetic field will be along axis...
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