Let a,b R and a^2+b^2 0. Suppose S= z C :z= 1 a+ibt ,t R ,t 0 , where i= -1 . If z=x+iy and z S, then (x,y) lies on

JEE Advanced 2016 Mathematics question

Let and . Suppose , where . If and , then lies on

Answer: (A),(C),(D)

, so , and (for ). The locus is : a circle with centre and radius . (A) For this is exactly

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Question ID VK-026584