1
JEE Main 2023 (Online) 31st January Evening Shift
Numerical
+4
-1
Let $\vec{a}, \vec{b}, \vec{c}$ be three vectors such that

$|\vec{a}|=\sqrt{31}, 4|\vec{b}|=|\vec{c}|=2$ and $2(\vec{a} \times \vec{b})=3(\vec{c} \times \vec{a})$.

If the angle between $\vec{b}$ and $\vec{c}$ is $\frac{2 \pi}{3}$, then $\left(\frac{\vec{a} \times \vec{c}}{\vec{a} \cdot \vec{b}}\right)^{2}$ is equal to __________.
2
JEE Main 2023 (Online) 31st January Morning Shift
Numerical
+4
-1

Let $$\vec{a}$$ and $$\vec{b}$$ be two vectors such that $$|\vec{a}|=\sqrt{14},|\vec{b}|=\sqrt{6}$$ and $$|\vec{a} \times \vec{b}|=\sqrt{48}$$. Then $$(\vec{a} \cdot \vec{b})^{2}$$ is equal to ___________.

3
JEE Main 2023 (Online) 29th January Morning Shift
Numerical
+4
-1

Let $$\overrightarrow a$$, $$\overrightarrow b$$ and $$\overrightarrow c$$ be three non-zero non-coplanar vectors. Let the position vectors of four points $$A,B,C$$ and $$D$$ be $$\overrightarrow a - \overrightarrow b + \overrightarrow c ,\lambda \overrightarrow a - 3\overrightarrow b + 4\overrightarrow c , - \overrightarrow a + 2\overrightarrow b - 3\overrightarrow c$$ and $$2\overrightarrow a - 4\overrightarrow b + 6\overrightarrow c$$ respectively. If $$\overrightarrow {AB} ,\overrightarrow {AC}$$ and $$\overrightarrow {AD}$$ are coplanar, then $$\lambda$$ is equal to __________.

4
JEE Main 2023 (Online) 24th January Evening Shift
Numerical
+4
-1

Let $$\overrightarrow a = \widehat i + 2\widehat j + \lambda \widehat k,\overrightarrow b = 3\widehat i - 5\widehat j - \lambda \widehat k,\overrightarrow a \,.\,\overrightarrow c = 7,2\overrightarrow b \,.\,\overrightarrow c + 43 = 0,\overrightarrow a \times \overrightarrow c = \overrightarrow b \times \overrightarrow c$$. Then $$\left| {\overrightarrow a \,.\,\overrightarrow b } \right|$$ is equal to

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