A story about kids who have magnetic powers

A boy discovers that he has magnetic powers he can generate with his hands. A lady’s grocery bag explodes and he can throw around canned goods without touching them. When he exercises this power, his hands get hot. He finds other kids like himself and discovers that their mothers all took part in testing a new drug while they were in the womb, there may have been a genetic component. There’s a scene where they need to erase a bunch of magnetic (video? data?) tapes or computer memory or something like that which they have to generate a strong magnetic field to do so, and the heat becomes almost unbearable.

There are a lot of other questions searching for stories about telekinetic kids, but I distinctly remember that this isn’t telekinetic.

It think it was targeted at early readers, 4th-6th grade, so I think short story would be the most accurate classification. But I remember it being in its own binding, so maybe 100 pages.