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Length of $2 \hat{i} + 3 \hat{j} + 4 \hat{k}$ in the xy plane is

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Correct option is A

Length in XY plane is 22+(3)2=13

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Length of 2i^+3j^+4k^ in the xy plane is

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Length of $2 \hat{i} + 3 \hat{j} + 4 \hat{k}$ in the xy plane is