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Diamagnetic substances have no intrinsic magnetic dipole. However, a strong external field can induce a dipole, but in the opposite direction to the applied field (Lenz's Law). A diamagnetic substance will therefore move away from the strong field. Diamagnetic effects are weak (all substances are diamagnetic, but it is swamped by any para or ferromagnetic property), so its movement towards the flat pole is subtle.
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