Physics, asked by VinayMahore, 1 year ago

please tell me answer

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Answered by raju84

your answer is d
P^×Q^=0
a=-8

Answered by JunaidMirza

Dot product of two perpendicular vectors is zero.

So,
P · Q = (5i + 7j - 3k) · (2i + 2j - ak)
0 = 10 + 14 + 3a
3a = -24
a = -8

[d] is the correct option.

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