1.

If z = x + iy and |z – zi| = 1, then(A) z lies on X-axis(B) z lies on Y-axis(C) z lies on a rectangle(D) z lies on a circle

Answer»

(D) z lies on a circle

|z – zi | = |z| |1 – i| = 1

\(\therefore\) |z| = 1/√2

\(\therefore\) x2 + y2 = 1/2



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