What are electrical and magnetic properties and how can they be reversed?

I was doing some research and something said something about electrical and magnetic properties and something about reversing them but I dont understa

I was doing some research and something said something about electrical and magnetic properties and something about reversing them but I don't understand. Can someone explain this to me?
Sorry if I said "something" too many times but that's the only explanation I can think of.

or:I was doing some research and something said something about electrical and magnetic properties and something about reversing them but I don't understand. Can someone explain this to me?Sorry if I said \"something\" too many times but that's the only explanation I can think of.

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