JEE Main & Advanced
Mathematics
Vector Algebra
Question Bank
Scaler or Dot product of two vectors and its application
question_answer
The vector \[2\,\mathbf{i}+\mathbf{j}-\mathbf{k}\] is perpendicular to \[\mathbf{i}-4\mathbf{j}+\lambda \mathbf{k},\] if \[\lambda =\] [MNR 1983; MP PET 1988]