Liquids and Do not show Weaker to Stronger to magnetism, stronger weaker materials move from weaker to stronger magnetic field Level of substance Rises, Do not rise, in U-tube stronger to from weeker stonger to weeker Strongly Weekly Opposite magnetized in magnetized direction of magnetizing Curie law or curve Parallel to graph temp 16. Properties of magnet: 01.Property of attraction. 2.Repulsion is the surest test to test a magnet. 3.Like poles repel and unlike poles attract. 4.Monopoles do not exist. 5.Force between two poles obeys inverse square law. 17. Magnetic Susceptibility (m) = M/H = MAGNETISATION / MAGNETIC INTENSITY 18. Classification of Ferromagnetic materials: Soft magnetic materials Hard magnetic Soft iron, Steel, alnico, alcomax Electromagnet, of Permanent magnet, transformer, motor, loud speakers generator, choke Permeability, High Low Susceptibility Coercivity, Hysterisis Low High loss, Retentivity FACTORS ON WHICH -------DEPENDS: Galvanometer: MAGNETIC FIELD: Soft iron core, Plane of the coil is parallel to magnetic field. Magnetic field increases. Sensitivity: Large deflection for a small current / I = NAB/k
Liquids and Do not show magnetism, materials move from weaker to stronger magnetic field Weaker to stronger Stronger to weaker Level of substance in U-tube Rises, stronger to weeker Do not rise, from stonger to weeker Strongly magnetized in direction of magnetizing Weekly magnetized Opposite Curie law or graph curve Parallel to temp 16. Properties of magnet: 01.Property of attraction. 2.Repulsion is the surest test to test a magnet. 3.Like poles repel and unlike poles attract. 4.Monopoles do not exist. 5.Force between two poles obeys inverse square law. 17. Magnetic Susceptibility (m) = M/H = MAGNETISATION / MAGNETIC INTENSITY 18. Classification of Ferromagnetic materials: Soft magnetic materials Hard magnetic Soft iron, Steel, alnico, alcomax Electromagnet, of transformer, motor, generator, choke Permanent magnet, loud speakers Permeability, Susceptibility High Low Coercivity, Hysterisis loss, Retentivity Low High FACTORS ON WHICH -------DEPENDS: Galvanometer: MAGNETIC FIELD: Soft iron core, Plane of the coil is parallel to magnetic field. Magnetic field increases. Sensitivity: Large deflection for a small current / I = NAB/k
question-bank-class-xii-physics.docx