Magnetic effect of current was discovered by
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(b) Oersted, Law is the law that a steady electric current creates a magnetic fieldaround it This was discovered on April $21,$ $1820,$ by Danish physicist Hans Christian Oersted when he noticed that the needle of a compass next to a wire carrying current turned so that the needle was perpendicular to the wire. Oersted investigated and found the mathematical law which governs how strong the field was, which is now called Oersted's law.
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