Question

3
Which of the following is/are not vector quantity?
(A) Electric current
(B) Speed
(C) Mass
(D) All of these
30​

Answer 1

Answer:-

(D) All of these

Explanation:-

As we have learnt in lower classes, that the quantities which have magnitude as well as directions are termed as vector quantity.

Since mass and speed don't have directions they are scaler quantity.

Now the question arises that why doesn't they are vector quantity if it has direction?

Actually the quantity that have  magnitude as well as direction is a vector quantity is just a half truth. There are some rules for vector laws of addition. The quantity which follows these rules are termed as vector quantities.

Electric current can be added by simple algebra. They don't need any such vector rules.

Hence it is a scaler quantity.

Correct definition for vector Quantity:

A vector quantity is a quantity that has magnitude as well as direction and they obeys vector law of addition.

Examples of vector quantities:-

Velocity, force, displacement and acceleration.

Additional Information:

What is equality of vectors?

~Two vectors are said to be equal only when they have same magnitude as well as same directions.