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The resultant of two vector A and B is a...

The resultant of two vector A and B is at right angles to A and its magnitude is half of B. Find the angle between A and B.

A

`120^(@)`

B

`150^(@)`

C

`135^(@)`

D

None of these

Text Solution

Verified by Experts

The correct Answer is:
B

`Delta OQR " " cos alpha =(B//2)/(B)=(1)/(2) rArr " " alpha =60^(@)`
` " Hence" " " "Angle" =90+60=150^(@)`
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BANSAL-UNIT DIMENSION, VECTOR & BASIC MATHS-EXERCISE - 1 [SINGLE CORRECT CHOICE TYPE]
  1. For the figure shown .

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  2. The resultant of two vector A and B is at right angles to A and its ma...

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  3. If vec(A)=vec(B)+vec(C ), and the magnitudes of vec(A),vec(B),vec(C ) ...

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  4. A truck travelling due to north at 20m s^(-1) turns west and travels a...

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  5. What displacement must be added to the displacement 25hat(i)-6hat(j)m ...

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  6. The value of a unit vector in the direction of vector A=5hat(i)-12hat(...

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  7. Two vectors A and B lie in X-Y plane . The vector B is perpendicular t...

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  8. The two vectors A=2hat(i)+hat(j)+3hat(k) and B=7hat(i)-5hat(j)-3hat(k...

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  9. 0.4hat(i)+0.8hat(j)+chat(k) represents a unit vector, when c is :-

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  10. The resultant of vec(A) and vec(B) makes an angle alpha with vec(A) ...

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  11. I started walking down a road to day-break facing the sun. After walki...

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  12. If |vec(A)+vec(B)|=|vec(A)|=|vec(B)| then the angle between vec(A) and...

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  13. which of the following is not true ? If vec(A)=3hat(i)+4hat(j) and vec...

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  14. If vector vec(A)=hat(i)+2hat(j)+4hat(k) and vec(B)=5hat(i) represent t...

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  15. If vec(a) be a unit vector, then :-

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  16. If two numerical equal forces P and P acting at a point produce a resu...

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  17. Given that vec(A)+vec(B)=vec(R) and vec(A)+2vec(B) is perpendicular...

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  18. The value of lambda for two perpendicular vectors vec(A)=2vec(i)+lamb...

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  19. The resultant of two vectors of magnitude 3 units 4 units is 1 unit. ...

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  20. If vec(i) and vec(j) are unit vectors along x-axis and y-axis respecti...

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