Question: An iron bar can be easily magnetized by aligning it with the magnetic field lines of Earth and striking it lightly a few times with

An iron bar can be easily magnetized by aligning it with the magnetic field lines of Earth and striking it lightly a few times with a hammer. This works best if the bar is tilted down to match the dip of Earth's field. The hammering jostles the domains so they are better able to fall into alignment with Earth's field. The bar can be demagnetized by striking it when it is oriented in an east-west direction.

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