JEE Main201910 Jan 2019Morning ShiftPhysicsMathematics in PhysicsActual
In the cube of side 'a' shown in the figure, the vector from the central point of the face A B O D to the central point of the face B E F O will be:
Options
- A1 2 a k ^ - i ^
- B1 2 a i ^ - k ^
- C1 2 a j ^ - i ^
- D1 2 a j ^ - k ^
Correct answer
C. 1 2 a j ^ - i ^
Step-by-step solution
r B A → = r → B - r → A = - a 2 i ^ + a 2 j