no
The magnetic force on Earth is called Earth's magnetic field or also the geomagnetic field.
liquid core
Yes, Uranus has a magnetic field. A nice diagram is posted in the Wikipedia article on this chilly blue planet's magnetic field, and a link is provided.
We are already on a planet with a magnetic field and yes magnetic fields are what protect the planet from various dangers. Not to mention nearly every planet we have seen has a magnetic field (save venus). It is believed that the magnetic fields of planets save them from solar winds which would otherwise slowly strip the atmospheres of planets by taking out chunks of atoms every time they hit. Mars has an extremely weak (or none according to many scientists) magnetic field and as such the solar winds bash into it and scoop out ions from the planet. Overall conclusion: Yes, you want to visit a planet with a strong magnetic field, it's basically more protection (in theory at least).
Mercury
no
Mars has a magnetic field.
Most importantly to us, the earth has a permanent magnetic field.
The magnetic force on Earth is called Earth's magnetic field or also the geomagnetic field.
Planet Earth
Jupiter
liquid core
Yes, Uranus has a magnetic field. A nice diagram is posted in the Wikipedia article on this chilly blue planet's magnetic field, and a link is provided.
The size and fluidity of the core of the planet.
Venus has neither.
Large deposits of iron ore within the planet generate the planet's magnetic field.for protection