"Powerful magnets" refers to magnets that have a strong magnetic force or pull. They can attract or repel objects with great force and are able to hold or lift heavy objects.
Sentences with «powerful magnets»
This machine uses powerful magnets to measure blood flows throughout the brain. (sciencenewsforstudents.org)
The keyboard is held in place by powerful magnets. (ipadcreative.com)
Magnetic toys are often recalled because the small, powerful magnets inside them can loosen and fall out. (babycenter.com)