Complex Numbers 3 Question 10

10. Match the conditions/expressions in Column I with statement in Column II (z0 is a complex number )

Column I Column II
A. Re(z)=0 p. Re(z2)=0
B. arg(z)=π4 q. Im(z2)=0
r. Re(z2)=Im(z2)

Analytical & Descriptive Questions

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Answer:

Correct Answer: 10. Aq;Bp

Solution:

  1. Let z=a+ib.

Given, Re(z)=0a=0

Then, z=ibz2=b2 or lm(z2)=0

Therefore, Aq

Also, given, arg(z)=π4.

Let

z=rcosπ4+isinπ4

Then,

z2=r2cos2π4sin2π4+2ir2cosπ4sinπ4=ir2sinπ/2=ir2

Therefore, Re(z2)=0Bp. a=b=23 [a,b(0,1)]



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