T-Rex: Because the planet spins, the earth's liquid core acts as a dynamo, generating a magnetic field! And magnetism can do some cool stuff, but at our current rotational speed we only get about 60 microteslas of force, which ISN'T MUCH.
T-Rex: A stupid fridge magnet alone is 80 times stronger, and those are BORING!
T-Rex: But check it: multiply the Earth's magnetic field by a quarter of a million times, and you've got magnetic force to mess with the electrons in a frog's atoms enough that it LEVITATES. The average frog weighs 1/4000th of a human, so therefore with a billion times the earth's magnetic field, EVERY HUMAN
T-Rex: ON THE PLANET
T-Rex: WOULD LEVITATE OFF INTO THE SKY.
T-Rex: So let's assume the planet's magnetic field increases linearly with rotation!
Utahraptor: Sure, why not?
Utahraptor: Then to get your desired magnetic field you just need the planet to spin a billion times faster - at which point each day would last, oh I don't know, about 40 MILLIONTHS of a second.
T-Rex: Well frig!! At that speed the planet would tear itself apart anyway! I'm wasting my time!
T-Rex: If I can tear the planet apart, there's got to be easier ways to get a tiny woman off my couch! THAT'S RIGHT TINY WOMAN, I NOTICED YOU HANGING OUT ON MY COUCH; IT WEIRDED ME OUT AND I STARTED DOING MATH
T-Rex: ANYWAY
T-Rex: "HERE WE ARE"
