Direction ratios room a, b, c then Magnitude =(sqrt ma^2 + mb^2 + mc^2 )

Calculation:

We have,

Direction ratios that PQ = 2(1) – 3, 3(1) + 3, 4(1) – 8

⇒ -1, 6, -4

∴ size = size of PQ =(sqrt left( - 1 ight)^2 + left( 6 ight)^2 + left( - 4 ight)^2 )

(= sqrt 1 + 36 + 16 )

(= sqrt 53)

Hence, alternative (c) is correct.

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