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How can magnetic fields be created?

Answer 1

Electro-magnets of very high power can be used to create magnetic fields.

Super conducting electro-magnets are used in large hadron collider which have the most powerful electro-magnets on Earth.

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Answer 2
Declan Carroll
Electric currents have the ability to generate magnetic fields. Ampère's law describes the phenomenon that occurs when electric charges move, producing a magnetic field around them. Additionally, materials classified as ferromagnetic materials can generate magnetic fields because their atomic or molecular magnetic moments align.
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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

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