A large powerful electromagnet will do the trick. In the past, there were some made and sold specifically for this purpose: bulk tape erasers. I got one back 20 years or so ago at Radio Shack for something like $15. Basically it was nothing more than said electromagnet with a power cord, switch, and plastic cover and handle. You could probably make something similar out of the magnets off old stereo speakers.
If you want to be even more secure, then burn the tapes after scrambling/erasing them with the magnet.
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I suggest that you incinerate it.
A large powerful electromagnet will do the trick. In the past, there were some made and sold specifically for this purpose: bulk tape erasers. I got one back 20 years or so ago at Radio Shack for something like $15. Basically it was nothing more than said electromagnet with a power cord, switch, and plastic cover and handle. You could probably make something similar out of the magnets off old stereo speakers.If you want to be even more secure, then burn the tapes after scrambling/erasing them with the magnet.
a) The production of an electric or magnetic state by the proximity (without contact) of an electrified or magnetized body. b) The production of an electric current in a conductor by a change of magnetic field.
The same way you destroy anything else. melt it in a furnace is the only way because if you chop it one end will be south and the other will be north If you mean "How do you remove the magnetism from a permanent magnet?" There are several ways. You can heat it past its Curie Point. For iron that is about 800C. Stroking one magnet with another in a random fashion will sometimes work. Hammering it will usually work.
Water is non-magnetic because it does not contain any magnetic properties. Its molecules are not aligned in a way that creates a magnetic field.