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A vector $P = 3 \hat{i} - 2 \hat{j} + a \hat{k}$ is perpendicular to the vector $Q = 2 \hat{i} + \hat{j} - \hat{k}$ . The value of a is

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Since, vector P is perpendicular to the vector Q.∴ P·Q=0⇒(3i^-2j^+ak^)·(2i^+j^-k^)=0⇒ 6-2-a=0⇒a=4

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A vector P=3i^-2j^+ak^ is perpendicular to the vector Q=2i^+j^-k^. The value of a is

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A vector $P = 3 \hat{i} - 2 \hat{j} + a \hat{k}$ is perpendicular to the vector $Q = 2 \hat{i} + \hat{j} - \hat{k}$ . The value of a is