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JEE Advanced2010MathematicsComplex NumberActual

Match the statements of Column I with these in Column II. [Note : Here z takes values in the complex plane and Im (z) and Re (z) denote respectively, the imaginary part and the real part of z ]

Options

  1. A(A) q, (B) p, (C) p,s, (D) q,r,s
  2. B(A) q,r, (B) p, (C) p,s,t, (D) q,r,s,t
  3. C(A) q, (B) q, (C) p,s,t, (D) q,r,s,t
  4. D(A) q,r, (B) q, (C) p,s, (D) q,r,s

Correct answer

B. (A) q,r, (B) p, (C) p,s,t, (D) q,r,s,t

Step-by-step solution

(A) z is equidistant from the points i|z| and -i|z| , whose perpendicular bisector is Im (z)=0 . (B) Sum of distance of z from (4,0) and (-4,0) is a constant 10 , hence locus of z is ellipse with semi-major axis 5 and focus at ( 4,0), a e=4 . e= 4 5 (C) |z| |w|+ | 1 w |= 5 2 < 3 (D) |z| |w|+ | 1 w |=2 Re (z) |z| 2

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