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I'm looking for a figure from a textbook which showing the field lines of a quadrupole. The quadrupole i'm looking for is four charges arranged on the corners of a square, 2 diagonal -ve charges and 2 diagonal positives. Please let me know if you have seen such a fieldlines in any text book.

The figure i'm looking for is exactly as the attachment, but I need to find such a figure in a textbook.

Thanks

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# Electric Quadrupole

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