Notes

  Noteswala 2020 Magnetic effect of Electric current Any substance that attracts iron and iron like objects is defined as magnet. When a wire carries an electric current, it behaves as a magnet. Properties of Magnet Every magnet has north and south poles. Same poles repel each other and unlike poles attract each other. A freely suspended magnet will align itself in north south direction, north facing north of the magnet and south facing south of the magnet. Characteristics of Field Lines Field lines arise from north pole and end into south pole of the magnet. They are closed curves. Field lines never intersect each other. Direction of magnetic field lines inside the magnet is from south to north. Magnetic Field of a Bar Magnet Hold the thumb, forefinger and middle finger of right hand at right angles to each other. If the forefinger is in direction of magnetic field and the thumb points in the direction of motion of conductor, than the direction of induced current is indicated by m...