Arrange the vectors in descending order of their magnitudes. (A) $\hat{i}+\hat{j}+\hat{k}$ (B) $2\hat{i}-3\hat{j}$ (C) $\frac{1}{2}\hat{i}-\frac{1}{3}\hat{j}$ (D) $2\hat{i}-\hat{k}$ Choose the correct answer from the options given below: |
(B), (A), (C), (D) (B), (D), (A), (C) (C), (A), (D), (B) (C), (A), (B), (D) |
(B), (D), (A), (C) |
the correct answer is Option 2: (B), (D), (A), (C) (a) Magnitude of a vector $\hat{i}+\hat{j}+\hat{k}$ = √{(1)2 + (1)2 + (1)2} = √3 (b) Magnitude of a vector $2\hat{i}-3\hat{j}$ = √{(2)2 +(-3)2 } = √13 (c) Magnitude of a vector $\frac{1}{2}\hat{i}-\frac{1}{3}\hat{j}$ = √{(1/2)2 +(-1/3)2 } = (√13)/ 6 (d) Magnitude of vector $2\hat{i}-\hat{k}$ = √{(2)2 +(-1)2 } = √5 √13 > √5 > √3 > √13⁄6 (B) > (D) > (A) > (C)
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