Home
Class 12
MATHS
If veca=2hati+hatj+4hatk and vecb=3hati-...

If `veca=2hati+hatj+4hatk` and `vecb=3hati-2hatj+hatk` then `veca.vecb=`

A

6

B

3

C

8

D

5

Text Solution

Verified by Experts

The correct Answer is:
C
Promotional Banner

Topper's Solved these Questions

  • SOLVED SAMPLE QUESTION PAPERS

    JMD PUBLICATION|Exercise EXAMPLE|260 Videos

Similar Questions

Explore conceptually related problems

If veca=2hati+hatj+7hatk and vecb=5hati-3hatj+10hatk , then veca*vecb is :

If veca=hati-hatj+hatk and vecb=5hati-hatj+2hatk , then veca*vecb is :

If veca=2hati+3hatj-5hatk and vecb=hati+hatj-hatk , then veca*vecb is :

If veca=2hati+3hatj-5hatk and vecb=hati+hatj-hatk , then veca*vecb is :

If veca=3hati-hatj+2hatk and vecb=2hati+3hatj+3hatk then veca.vecb is equal to :

If veca=3hati-hatj+2hatk and vecb=hati-3hatk then veca.vecb is

If veca=2hati-hatj+hatk and vecb=2hatj-hatk then veca.vecb is equal to :

JMD PUBLICATION-VECTOR ALGEBRA-EXAMPLE
  1. Find p if vectors veca=2hati-hatj+phatk and vecb=hati-2hatj+hatk are p...

    Text Solution

    |

  2. If veca is a unit vector and (vecx-veca).(vecx+veca)=255 then find |ve...

    Text Solution

    |

  3. If veca=2hati+hatj+4hatk and vecb=3hati-2hatj+hatk then veca.vecb=

    Text Solution

    |

  4. If |veca|=1,|vecb|=2 and veca*vecb=1. Then the angle between veca and ...

    Text Solution

    |

  5. If |veca*vecb|=sqrt3|vecaxxvecb|,then angle between veca and vecb is :

    Text Solution

    |

  6. Find |veca-vecb|, if two vectors veca and vecb are such that |veca|=2,...

    Text Solution

    |

  7. Fill in the blanks : If veca=xhati+2hatj-3hatk and vecb=3hati+bhatj-...

    Text Solution

    |

  8. Fill in the blanks : Unit vector in direction of 2hati-3hatj+6hatk=(...

    Text Solution

    |

  9. Fill in the blanks : If veca=3hati+hatj-2hatk and vecb=hati+lamdahat...

    Text Solution

    |

  10. If |veca*vecb|=|vecaxxvecb|,then angle between veca and vecb is :

    Text Solution

    |

  11. Fill in the blanks : If |\vecaxxvecb|^2+(veca.vecb)^2=400 and |\vec...

    Text Solution

    |

  12. State True/False The value of veca.veca is |\veca|^2.

    Text Solution

    |

  13. State True/False If veca is unit vector and (2vecx-3veca).(2vecx+3ve...

    Text Solution

    |

  14. State True/False Then magnitude of 2hati-3hatj+6hatk is 7 units.

    Text Solution

    |

  15. Write the value of (hatixxhatj).k+(hatjxxhatk).hati.

    Text Solution

    |

  16. Write the value of p for which veca=3hati+2hatj+9hatk and vecb=hati+ph...

    Text Solution

    |

  17. Prove that : (vecaxxvecb)^2=|\veca|^2.|\vecb|^2-(veca.vecb)^2.

    Text Solution

    |

  18. If veca=4hati+3hatj+hatk and vecb=hati-2hatk, find |\2vecbxxveca|.

    Text Solution

    |

  19. The projection of veca=2hati-hatj+hatk on vecb=hati-2hatj+hatk is equa...

    Text Solution

    |

  20. Find unit vector in the direction of veca+vecb, where veca=-hati+hatj+...

    Text Solution

    |