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JEE MATHEMATICS MCQ: COMPLEX NUMBERS

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Analyzing +4 | -1

If

\left| {{z_1}} \right| = \left| {{z_2}} \right| = \ldots = \left| {{z_n}} \right| = 1,\;

then the value of

\left| {{z_1} + {z_2} + {z_3} + ... + {z_n}} \right|

is

View answer and explanation

Correct option: C

\left| {\frac{1}{{{z_1}}} + \frac{1}{{{z_2}}} + ... + \frac{1}{{{z_n}}}} \right|

Option C (

\left| {\frac{1}{{{{z_1}}}} + \frac{1}{{{{z_2}}}} + ... + \frac{1}{{{{z_n}}}}} \right|

) is correct because it uses the property that if

|z| = 1

, then

\bar{z} = \frac{1}{z}

and

|z| = |\bar{z}|

.

More Questions from COMPLEX NUMBERS

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The number of non-zero integer solutions of the equation

{\left| {1 - i} \right|^x} = {2^x}

|z|=1

z \neq \pm 1

, then for any complex number

z, \frac{z}{1-z^2}

\left|z_r-r\right| \leq r, \forall r=1,2,3, \ldots, n

\left|\sum\limits_{r=1}^n z_r\right|

is less than The roots of the cubic equation

(z+a b)^3=a^3

a \neq 0

represents the vertices of a triangle. If

\alpha, \beta

\gamma

are the roots, then find the value of

|\alpha-\beta|

. Number of solutions of the equation

{z^2} + {\left| z \right|^2} = 0,

z \in C

2x = - 1 + \sqrt 3 i

, then the value of

{\left( {1 - {x^2} + x} \right)^6} - {\left( {1 - x + {x^2}} \right)^6}