Let a = i + j + 2 k, b = b_1 i + b_2 j + 2 k and c = 5 i + j + 2 k be three vectors such that the projection...

Question

Let a = i + j + 2 k, b = b_1 i + b_2 j + 2 k and c = 5 i + j + 2 k be three vectors such that the projection vector of b on a is a. If a + b is perpendicular to c, then | b| is equal to:

Accepted Answer

(C)

JEE Main 2019 Mathematics question

Solution

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