Maxwells’s right hand cork screw rule


If  a  right  handed  cork  screw  is  rotated  to  advance  along  the direction  of  the  current  through a  conductor,  then  the  direction  of rotation  of  the  screw  gives  the  direction  of  the  magnetic lines  of  force around  the  conductor.
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Algebra Formulas collection

(a+b) 2  = a 2  + b 2  + 2ab (a-b) 2  = a 2  + b 2  – 2ab (a+b) (a-b) = a 2  – b 2 (x + a)(x + b) = x 2  + (a + b)x + ab (x + a)(x – b) = x ...