Question

Let ⃗a = 3î + 2j^ + 2k^ and ⃗b = î + 2j^ - 2k^
be two vectors. If a vector perpendicular to both the vectors ⃗a + ⃗b and ⃗a - ⃗b has the magnitude 12 then one such vector is: (A) 4(2î – 2j^ – k^)
(B) 4(2î – 2j^ + k^)
(C) 4(2î + 2j^ + k^)
(D) 4(2î + 2j^ – k^)

Answer 1

Answer:

option B

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Answer 2

Answer:

Let ⃗a = 3î + 2j^ + 2k^ and ⃗b = î + 2j^ - 2k^

be two vectors. If a vector perpendicular to both the vectors ⃗a + ⃗b and ⃗a - ⃗b has the magnitude 12 then one such vector is:

(A) 4(2î – 2j^ – k^)

(B) 4(2î – 2j^ + k^)

(C) 4(2î + 2j^ + k^)

(D) 4(2î + 2j^ – k^)