vector

the imaginary i or j which is equivalent to square root of -1 has a phase difference of ____ with real number 1. what's the answer? choices are:
a.)0 degrees, along or within the force
b.)90 degrees
c.)360 degrees, one complete revolution
d.)180 degrees
e.)45 degrees, horizontal and vertical components are equal
thanks

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    IT'S 90 DEGREES!

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