Page 1 :
SSLC - PHYSICS [EM], 2019 - SYLLABUS, 2, MAGNETIC EFFECT OF ELECTRIC CURRENT, Magnetic field, » Magnetic field is the region surrounding a magnet, in which the force of the, magnet can be detected., » Magnetic field is also formed around a current carrying conductor., North Pole (N), Magnetic compass, Magnetic compass is a device used to, measure the strength and direction of, Magnetic Needle, magnetic field, South Pole (S), KK, Magnetic field lines, » The path along which North Pole of a magnetic needle moves in a magnetic, field is called magnetic field lines., Magnetic field lines start from North Pole, and end at the South Pole., JA, Can you find out the polarity of magnets ?, ?, Figure 1, Figure 2, JABIR KK, 1, www.shenischool.in
Page 2 :
BAR MAGNET AND ELECTROMAGNET, Bar magnet, Electromagnet, Permanent magnet, Temporary magnet, The poles cannot be changed, The poles can be altered, Strength of the magnetic field is, Strength of the magnetic field can, be varied, constant, OERSTED'S EXPERIMENT, Materials required, • Magnetic needle, • Conductor, • Battery, • Switch, Hans Christian Oested, Experiment-1, Position of conductor, above the magnetic needle, A to B, Direction of current, :, A, В, Movement of North Pole of the magnetic needle: Anti Clockwise, 2, JABIR KK, www.shenischool.in
Page 3 :
Experiment-2, Position of conductor, above the magnetic needle, B to A, :, Direction of current, :, +, A, В, Movement of North Pole of the magnetic needle: Clockwise, Experiment-3, Position of conductor, :, Below the magnetic needle, Direction of current, :, A to B, (K, A, B, Movement of North Pole of the magnetic needle: Clockwise, Experiment-4, Position of conductor, Below the magnetic needle, Direction of current, B to A, A, Movement of North Pole of the magnetic needle: Anti Clockwise, JABIR KK, 3, www.shenischool.in
Page 4 :
Conclusions from the above experiments, » A current carrying conductor produces a magnetic field around it., The direction of magnetic field in a current carrying conductor depends, the direction of current passing through them, MAGNETIC FIELD AROUND A STRAIGHT CONDUCTOR, Experiment-1, Insert a straight conductor (AB) through a cardboard and keep it in a vertical, positions as shown in figure., Direction of the, magnetic field, around the point X, A, Direction of, Magnetic, Field, (Top View, of Cardboard), Anti Clockwise, Experiment-2, Direction of Magnetic Field, (Top View of Cardboard), Anti Clockwise, Clockwise, A current carrying straight conductor produces a circular magnetic field around it., Direction of magnetic field (Clockwise/Anti clockwise) depends on the, direction of current., 4, JABIR KK
Page 5 :
RULES FOR FINDING THE DIRECTION OF MAGNETIC FIELD DUE TO, STRAIGHT CURRENT CARRYING CONDUCTOR., Right hand thumb rule (james clark Maxwell), Imagine you are holding a current carrying conductor with the right hand in, such a way, that the thumb points in the direction of the current. The direction, in which the other fingers encircle the conductor gives the direction of the, magnetic field., Direction of, Current, Direction of, Kthe Magnetic, field, Direction of, the Magnetic, field, Direction of, Current, Direction of, Right hand screw rule, the Magnetic, field, If a right hand screw is rotated in such a way, that its tip advances along the direction of the, current of the current in the conductor, then, the direction of rotation of the screw gives the, direction of the magnetic field around the, conductor., Direction of, Current, Direction of Current, Magnetic field around a circular loop, » Insert a circular conductor through, a cardboard and a current is passed, through it, A, » When the electric current passes, in the clockwise direction, the, magnetic field lines, move away from us into the coil, through the central part of the coil., appear to, JABIR KK
