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Question

If arg(z23i)=π2 then the locus of z is:

A
Straight line
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B
An ellipse
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C
A circle
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D
A parabola
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Solution

The correct option is A Straight line
Let
z=x+iy
Hence substituting in the above equation, we get
z=(x2)+i(y3)
The real part of z is zero.
Hence,
x2=0
x=2
Hence, the locus of z is a straight line.

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