एक टॉर्च के वॉल par 2.5v, 500MA likha hai to balb ka pratirodh aur sakti jnat kare
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In 1820, a Danish physicist, Hans Christian Oersted, discovered that there was a relationship between electricity and magnetism. By setting up a compass through a wire carrying an electric current, Oersted showed that moving electrons can create a magnetic field.
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