🛠️ JEE➗ Maths

Let \(\vec{a}=2 \hat{i}+\hat{j}+\hat{k}\), and \(\vec{b}\) and \(\vec{c}\) be two nonzero vectors such that \(|\vec{a}+\…

Q1

Let \(\vec{a}=2 \hat{i}+\hat{j}+\hat{k}\), and \(\vec{b}\) and \(\vec{c}\) be two nonzero vectors such that \(|\vec{a}+\vec{b}+\vec{c}|=|\vec{a}+\vec{b}-\vec{c}|\) and \(\vec{b} \cdot \vec{c}=0\). Consider the following two statement:
(A) \(|\vec{a}+\lambda \vec{c}| \geq|\vec{a}|\) for all \(\lambda \in R\).
(B) \(\vec{a}\) and \(\vec{c}\) are always parallel. Then

[JEE Main 2023, 31 Jan (Shift 1)]

a

only (B) is correct

b

neither (A) nor (B) is correct

c

only (A) is correct

d

both (A) and (B) are correct.

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