The Moon doesn't have one. At least if it does have one, then it's very faint. Jupiter's magnetic field works the same as Earth's. It has a molten metallic hydrogen core that flows and creates the the dynamo effect. Earth has an outer core that is liquid iron that rotates and generated this field. Jupiter's magnetic field is 14 times stronger than Earth's. In fact, it's so strong that if, you tune your car radio to dead radio station with static during(it was either) a certain part of the year or part of the night when driving on a deserted & or quiet country road, that you can sometimes hear a beeping/chirping/etc sound. It's the sound of Jupiter's magnetic field.
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reduction factor is used to find earth's magnetic field and compare galvanometer constants
Magnetic field lines don't cross.
All materials are magnetized when placed in the magnetic field . The material magnetized by the effect of a magnetic field is called magnetic permeability.
"Magnetic flux density" is also known as the magnetic field,The SI unit for this is the Tesla, written as T.CommentMagnetic flux density is not "also known as the magnetic field". It describes the intensity of a magnetic field.
A magnetic field is neither: it is a vector field with both direction and quantity.