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Question:

In the cube of side 'a' shown in the figure, the vector from the central point of the face ABOD to the central point of the face BEFO will be

12a(^i−^k)

12a(^j−^i)

12a(^k−^i)

12a(^j−^k)

Solution:

The correct option is B
12a(^j−^i)
→rg=a2^i+a2^k
→rH=a2^j+a2^k
→rH−→rg=a2(^j−^i).