>
Exams
>
Mathematics
>
Complex numbers
>
if a 0 a r z a 2i and z az 1 then
Question:
If a > 0, a R, z = a + 2i and |z| = -az + 1, then:
Show Hint
Modulus of a complex number is always real and non-negative.
BITSAT - 2011
BITSAT
Updated On:
Mar 18, 2026
z is always a positive real number
z is always a negative real number
z is purely imaginary number
such a complex z does not exist
Show Solution
Verified By Collegedunia
The Correct Option is
D
Solution and Explanation
Step 1: Modulus property.
|z| is always non-negative real.
Step 2: Contradiction.
Equation leads to imaginary RHS, hence impossible.
Download Solution in PDF
Was this answer helpful?
0
0
Top BITSAT Mathematics Questions
The locus of the mid-point of a chord of the circle \( x^2 + y^2 = 4 \), which subtends a right angle at the origin is
BITSAT - 2026
Mathematics
circle
View Solution
If \( f(x) = \int_0^x t(\sin x - \sin t)dt \) then :
BITSAT - 2026
Mathematics
Definite Integral
View Solution
If \( x = \sqrt{2^{\text{cosec}^{-1} t}} \) and \( y = \sqrt{2^{\text{sec}^{-1} t}} (|t| \ge 1) \), then dy/dx is equal to :
BITSAT - 2026
Mathematics
Derivatives of Functions in Parametric Forms
View Solution
The value of x is maximum for
BITSAT - 2026
Mathematics
Maxima and Minima
View Solution
Let P be a point on the parabola, \( x^2 = 4y \). If the distance of P from the centre of the circle, \( x^2 + y^2 + 6x + 8 = 0 \) is minimum, then the equation of the tangent to the parabola at P, is :
BITSAT - 2026
Mathematics
sections of a cone
View Solution
View More Questions
Top BITSAT Complex numbers Questions
If \( z = x + iy \) is a complex number such that \( |z - 1| = |z + 1| \), then the locus of \( z \) represents:
BITSAT - 2025
Mathematics
Complex numbers
View Solution
If \( z = 2(\cos 60^\circ + i \sin 60^\circ) \), find the value of \( z^3 \).
BITSAT - 2025
Mathematics
Complex numbers
View Solution
If \( |z_1| = 2, |z_2| = 3, |z_3| = 4 \) and \( |2z_1 + 3z_2 + 4z_3| = 4 \), then the absolute value of \( 8z_2z_3 + 27z_1z_3 + 64z_1z_2 \) equals:
BITSAT - 2024
Mathematics
Complex numbers
View Solution
If \( z_1, z_2, \dots, z_n \) are complex numbers such that \( |z_1| = |z_2| = \dots = |z_n| = 1 \), then \( |z_1 + z_2 + \dots + z_n| \) is equal to:
BITSAT - 2024
Mathematics
Complex numbers
View Solution
If \( z, \bar{z}, -z, -\bar{z} \) forms a rectangle of area \( 2\sqrt{3} \) square units, then one such \( z \) is:
BITSAT - 2024
Mathematics
Complex numbers
View Solution
View More Questions
Top BITSAT Questions
The locus of the mid-point of a chord of the circle \( x^2 + y^2 = 4 \), which subtends a right angle at the origin is
BITSAT - 2026
circle
View Solution
A passenger sitting in a train A moving at 90 km/h observes another train B moving in the opposite direction for 8 s. If the velocity of the train B is 54 km/h, then length of train B is:
BITSAT - 2026
Relative Velocity
View Solution
If \( f(x) = \int_0^x t(\sin x - \sin t)dt \) then :
BITSAT - 2026
Definite Integral
View Solution
If \( x = \sqrt{2^{\text{cosec}^{-1} t}} \) and \( y = \sqrt{2^{\text{sec}^{-1} t}} (|t| \ge 1) \), then dy/dx is equal to :
BITSAT - 2026
Derivatives of Functions in Parametric Forms
View Solution
The Bohr orbit radius for the hydrogen atom (n = 1) is approximately 0.530 \AA. The radius for the first excited state (n = 2) orbit is (in \AA)
BITSAT - 2026
Bohr's model of hydrogen atom
View Solution
View More Questions