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What happens, when we multiply a vector ...

What happens, when we multiply a vector by `(-2)`

A

Direction reverses and unit charges

B

Direction reverses and magnitude is doubled

C

Direction remains unchanged and unit changes

D

None of the above

Text Solution

Verified by Experts

The correct Answer is:
B
(b)When a vector is multiplied by a negative scalar number, then its magnitude gets change and direction gets reversed.
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MHTCET PREVIOUS YEAR PAPERS AND PRACTICE PAPERS-SCALARS AND VECTORS -Exercise 1
  1. The magnitude of hat(i)+hat(j) is

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  2. A vector multiplied by the number 0, results into

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  3. What happens, when we multiply a vector by (-2)

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  4. vecA + vecB can also be written as

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  5. If P+Q=0. Then which of the following is necessarily ture?

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  6. Two vector having magnitude 8 and 10 can maximum and minium value of m...

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  7. vec(P)+vec(Q) is a unit vector along x-axis. If vec(P)= hat(i)-hat(j)+...

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  8. For the resultant of two vectors to be maximum , what must be the ...

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  9. What are minmum number or unequal fores whose vector sum is zero ?

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  10. Given that P+Q+R=0. Which of the following statement is true?

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  11. A=2hat(i)+hat(j),B+3hat(j)-hat(k)and C=6hat(i)-2hat(k) Value of A-2B+3...

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  12. if P+Q+P-Q ,then

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  13. What vector must be added to the sum of two vectors 2hat(i)-hat(j)+3ha...

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  14. If |A|=2 and |B|=4 and angle between then is 60^(@) then |A-B|

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  15. If A and B are two vectors such that |A+B|=2|A-B|. The angle between v...

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  16. At what angle should the two forces 2P and sqrt(2P) and Psqrt(2)P act...

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  17. Three forces acting on a boby are shown in the figure. To have the re...

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  18. Three vector A,B and C satisfy the relation A.B=0 and A. C =0. Then t...

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  19. what is the dot product of two vectors of magnitudes 3 and 5,if angle ...

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  20. When A.B =-|A||B|, then

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