Class 7 Physics Electric Current and its Effects Magnetic Effects of Current

Magnetic Effects of Current

When an electric current passes through a wire, it behaves like a magnet. This magnetic effect of electric current is known as electromagnetic effect.

  • Hans Christian Oersted (1777-1851) discovered magnetic effect of current in 1820.
  • A compass is a watch like instrument which shows direction using the magnetic field produced inside the earth.
  • The compass needle is a tiny magnet which always point in North-South
  • If a compass is brought near a magnetor a circuit carrying current, the needle gets deflected due to magnetic field produced by both of them.
  • If the direction of current is reversed, the magnetic field also gets reversed.

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