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[Mentor's note: this thread was originally posted in a non-homework forum, therefore it does not have the homework template.]

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I have a question which is:

Let [itex]\vec{E} = E_0 \cdot (-y,x, z) [/itex] Can [itex]\vec{E}[/itex] be an electrostatic field? if yes, find the charge density which generates this field. If not, find the magnetic field which generates it

and,

Let [itex]\vec{E} = E_0 \cdot \vec{r} ) [/itex] Can [itex]\vec{E}[/itex] be an electrostatic field? if yes, find the charge density which generates this field. If not, find the magnetic field which generates it

I have no idea where to start, any help is appreciated.

------------

I have a question which is:

Let [itex]\vec{E} = E_0 \cdot (-y,x, z) [/itex] Can [itex]\vec{E}[/itex] be an electrostatic field? if yes, find the charge density which generates this field. If not, find the magnetic field which generates it

and,

Let [itex]\vec{E} = E_0 \cdot \vec{r} ) [/itex] Can [itex]\vec{E}[/itex] be an electrostatic field? if yes, find the charge density which generates this field. If not, find the magnetic field which generates it

I have no idea where to start, any help is appreciated.

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