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Prateek Kadkol from Gems Our Own English High School, asked a question
Subject: Science , asked on 30/5/12

what is snow rule ?


kranav.sharma... , Meritnation Expert added an answer, on 31/5/12

As answered previously...

This is not a rule in general rather this is a short cut to find the direction of the deflection of the needle of the magnetic compass needle when kept in some magnetic field produced by some current carrying wire. 

S---south (direction of current in the wire) 


O---over (the location of the wire) 

W---west (deflection)

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