I'm not enough of a physicist to know just what a powerful magnetic field can do, but it didn't sound pleasant.

The magic was still there, but suppressed by the more powerful field.

An extremely powerful field that was never to be underestimated.

Against the most powerful gravitational field of all the planets, it had no chance.

Apparently a really powerful magnetic field is needed to show this up.

Warren was adding a powerful magnetic field of his own, and increasing it.

He triumphed over a powerful field to win for the eighth time.

Means there must be pretty powerful magnetic fields around them.

He can cast powerful magnetic fields at distances up to 700 feet.

And what would be the influence of a much more powerful magnetic field?