JEE Main 2019 Mathematics question

Mathematics Complex Numbers JEE Main 2019

If (α ∈ R) is a purely imaginary number and |z| = 2, then a value of α is:

(A)
(B)
(C)2Correct
(D)1

Answer: (C)

Solution

Purely imaginary ⇒ ⇒ α = ±2.

Question ID VK-010351