Find the direction angle of vector u-2-9k-

The correct option is B 78^o Given, u⃗ = 2 i +9 k tanθ #160; =| 9 ( 2) #160; | =4.5 θ =tan ^ 1 (4.5) = 77.5 ^∘ #160; So none o ...

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Standard XII

Physics

Magnetic Dip

Find the dire...

Question

Find the direction angle of vector $\to u = - 2^i + 9^k$

75^{o}

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78^{o}

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85^{o}

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88^{o}

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Solution

The correct option is B $78^{o}$
Given, $\to u = - 2 i + 9 k$
$tan θ = ∣ ∣ ∣ \frac{9}{(- 2)} ∣ ∣ ∣ = 4.5 θ = {tan}^{- 1} (4.5) = {77.5}^{\circ}$
So none of the options are correct.

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Find the direction angle of vector →u=−2^i+9^k

The correct option is B 78oGiven, →u=−2i+9ktanθ=∣∣∣9(−2)∣∣∣=4.5θ=tan−1(4.5)=77.5∘So none of the options are correct.

Find the direction angle of vector $\to u = - 2^i + 9^k$

The correct option is B $78^{o}$
Given, $\to u = - 2 i + 9 k$
$tan θ = ∣ ∣ ∣ \frac{9}{(- 2)} ∣ ∣ ∣ = 4.5 θ = {tan}^{- 1} (4.5) = {77.5}^{\circ}$
So none of the options are correct.