Question:medium

If $\frac{z-1}{2z+1}$ is an imaginary number and if it represents a circle then its radius is

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For purely imaginary $(z-a)/(z-b)$, the points $z$ lie on a circle with diameter joining $a$ and $b$.
Updated On: May 12, 2026
  • $\frac{9}{16}$ units
  • $\frac{3}{4}$ units
  • $\frac{1}{4}$ units
  • $\frac{1}{2}$ units
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The Correct Option is B

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