" Define unit vector."

What is a null vector? Define a unit vector.

Define (i) unit vector (ii) null vector (iii) cross product of two vectors vec A and vec B .

Define the Vector

Define Coinitial vector and Collinear vector .

Define Poynting Vector? What is its unit?

(A) : hati+hatj is not a unit vector (R) : The addition of unit vectors never gives unit vector

If the sum of two unit vectors is also a unit vector. Then magnituce of their difference and angle between the two given unit vectors is