A positively charged particle projected towards west is deflected towards north by a magnetic field. State the direction of magnetic field. Which rule did you use to find direction?

Question

A positively  charged particle projected towards west is deflected towards north by a magnetic field. State the direction  of magnetic field. Which  rule did  you use to find direction?

Reed · Answer

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http://hyperphysics.phy-astr.gsu.edu/hbase/magnetic/magfie.html