The locus of a point $z$ satisfying $|z|^2=\operatorname{Re}(z)$ is a circle with centre

The locus of a point $z$ satisfying $|z|^2=\operatorname{Re}(z)$ is a circle with centre
  1. $\left(0, \frac{1}{2}\right)$
  2. $\left(-\frac{1}{2}, 0\right)$
  3. $\left(\frac{1}{2}, 0\right)$
  4. $\left(0,-\frac{1}{2}\right)$

Solution

Let $z=x+i y$ $|z|=\sqrt{x^2+y^2}$ Now, $|z|^2=\operatorname{Re}(z)$ $x^2+y^2=x$ $\Rightarrow \quad x^2+y^2-x=0$ $g=1 / 2, f=0$ So, centre of circle $\left(\frac{1}{2}, 0\right)$.

Asked in: AP EAMCET 2022 (05 Jul Shift 1)

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