WB JEE 2017 | Vector Algebra Question 12 | Mathematics

WB JEE 2017

MCQ (Single Correct Answer)

-0.5

For any vector x, where $$\widehat i$$, $$\widehat j$$, $$\widehat k$$ have their usual meanings the value of $${(x \times \widehat i)^2} + {(x \times \widehat j)^2} + {(x \times \widehat k)^2}$$ where $$\widehat i$$, $$\widehat j$$, $$\widehat k$$ have their usual meanings, is equal to

$$|x{|^2}$$

2$$|x{|^2}$$

3$$|x{|^2}$$

4$$|x{|^2}$$

WB JEE 2017

MCQ (Single Correct Answer)

-0.5

If the sum of two unit vectors is a unit vector, then the magnitude of their difference is

$$\sqrt 2 $$ units

2 units

$$\sqrt 3 $$ units

$$\sqrt 5 $$ units

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