1.

in some problems we use n2/n1= (poa- pa)/poa but in some other cases we use n2/n1= (poa-pa)/pa how to identify which one to use???

Answer»

in some problems we use n2/n1= (poa- pa)/poa

but in some other cases we use n2/n1= (poa-pa)/pa

how to identify which one to use???



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