Question:
Give an example of each of the followingGive an example of each of the following?
(i) Scalar quantity
(i) Vector quantity
(i) Unit vector
(i) A physical quantity which is expressed as vector product of two vectors
Answer:
(1) Scalar quantity - Physical quantity which have magnitude only.
Example- Distance, speed.
(2) Vector quantity - Physical quantity which have magnitude as well as direction, and obeys the laws of vector addition.
Example- velocity, acceleration.
(3) Unit vector- It is a vector whose magnitude is unity, denoted by a hat above the letter.
Example- If V is a vector then, unit vector of V is
(4) Torque on a dipole in a uniform electric field is a vector quantity, which is the vector product of dipole moment (vector) and electric field (vector).
Torque = p× E = pE sinΘ (p= dipole moment and E = electric field)
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