Magnetic effects of electric current · विद्युत धारा के चुंबकीय प्रभाव
A free Physics lesson for Class 10 children.
Magnetic field lines come out of the north pole of a magnet and go into its south pole. They never cross.
A wire carrying current produces a magnetic field around it. The right-hand thumb rule gives its direction.
A coil of wire with many turns is a solenoid. It behaves like a bar magnet when current flows.
A current-carrying wire placed in a magnetic field feels a force. Fleming’s left-hand rule gives its direction.
An electric motor uses this force to turn electrical energy into motion.
Moving a magnet near a coil produces a current in the coil. This is electromagnetic induction.
An electric generator uses induction to turn motion into electricity.
At home the live wire is red, the neutral wire is black and the earth wire is green. A fuse protects against too much current.