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