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...P a g e physics notes for class chapter magnetrism and matter the property of any object by virtue which it can attract piece iron or steel is called magnetism natural magnet an ore fe o attracts small pieces cobalt nickel towards magnetite lode stone artificial prepared artificially bar electromagnet magnetic needle horse shoe etc according to molecular theory every substance whether magnetised not complete itself poles are two points near but within ends at entire be assumed concentrated always occur in pairs they equal strength like repel unlike properties i freely suspended aligns into north south direction ii each other iii exist pair coulomb s law force interaction acting between directly proportional product their pole strengths inversely square distance them f m r where permeability free space www ncerthelp com visit all ncert solutions text videos cbse syllabus note many more dipole arrangement separated very current carrying loop moment l either its si unit joule tesla ampere...