Lf A-a-2-5k-B-2-4k- are perpendicular to each other- the value of a is-

The correct option is A 9If A⃗ and B⃗ are perpendicular to each other then A⃗. B⃗ = 0 2a 2+20=0 a= 9 ...

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Byju's Answer

Standard XII

Physics

Work Done as Dot Product

lf A⃗=aî+2ĵ...

Question

lf $\to A = a^i + 2^j - 5^k, \to B = 2^i -^j - 4^k$ are perpendicular to each other, the value of $a$ is:

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-9

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-4

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Solution

The correct option is A -9
If $\to A$ and $\to B$ are perpendicular to each other then $\to A . \to B = 0$
$⟹ 2 a - 2 + 20 = 0$
$⟹ a = - 9$

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lf →A=a^i+2^j−5^k,→B=2^i−^j−4^k are perpendicular to each other, the value of a is:

The correct option is A -9If →A and →B are perpendicular to each other then →A.→B=0⟹2a−2+20=0⟹a=−9

lf $\to A = a^i + 2^j - 5^k, \to B = 2^i -^j - 4^k$ are perpendicular to each other, the value of $a$ is:

The correct option is A -9
If $\to A$ and $\to B$ are perpendicular to each other then $\to A . \to B = 0$
$⟹ 2 a - 2 + 20 = 0$
$⟹ a = - 9$