Electric charge

As he was setting up his materials, he noticed acompass needle deflected from magnetic north when the electric current from the battery he was using was switched on and off. This deflection convinced him that magnetic fields radiate from all sides of a

The effect was named after the scientist Luigi Galvani, who investigated the effect of electricity on dissected animals in the 1780s and 1790s. While experimenting in his lab, his scalpel touched the body of a frog, and he saw the

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