Well, is there anything in comics to suggest that Ultron would not be affected by magnetic powers?
Question: Can Magneto one shot him?
Well, without really knowing for sure, my guess is "no." Ultron is a galaxy level threat, capable of taking on the Avengers and is one of the smartest, most cunning villains around. Surely it takes more than a magnet to defeat him.
- Back in the day I would agree that Magneto could easily rip him in half like he skinned the bones of Wolverine, but since the Avengers Unlimited arc they have really been pushing him as a bigger and bigger threat. His involvement in the recent cosmic events show this to an even greater level.
- It may not have been explained, but I think its safe to assume that Ultron is immune to EMP and magnetic manipulation due to some technological means yet to be named.
- Again, like anything in comics, any characters status can be changed at any moment if a writer feels like it. This is just my guess based on the past decade.
I would say that for now he can but this only due to there being no writer stating Ultron is immune to Magneto, otherwise the classic Magneto removing the adamantium from Wolverine shows that he could do the same to Ultrons body, or at the minimum the insides of Ultron which are never adamantium.
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