I know in junkyards cranes use electricity to make a magnet powerful enough to lift a car, but could a car battery be used the same way? Could it have enough juice to lift a car? Or maybe pull one?
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Depends on what you mean by “lift”. If you mean generate enough force to hold a steel object in direct contact while a cable lifts the electromagnet, that’s considerably easier than pulling the steel object to the electromagnet from a distance.
The big problem is that it will be difficult to get enough of the car close to the magnet, because the force falls off with the inverse square law. A magnet stuck to a thick steel plate will pull harder than the same magnet stuck to a thin piece of sheet metal.
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