Question

notes on vector... class 11​

Answer 1

Answer:

Vector Quantities are those quantities which require magnitude as well as direction for their complete specifications. Vectors are physical quantities, which besides having both magnitude and direction also obey the law of geometrical addition.

(The law of geometrical addition, i.e. the law of triangular addition and law of parallelogram are discussed later in this chapter). Some physical quantities, which are vectors are displacement, velocity, acceleration, force, electric intensity, magnetic intensity, magnetic moment etc. Vector quantities cannot, in general, be added in algebraically.

P.S.➟ Electric current possesses magnitude and direction (through the conductor), but it is not a vector quantity. Electric current is a scalar quantity.

★ Representation of a Vector

‡ Kindly Check the Attachment

Since vectors have directions, any representation of them has to include the direction.

Vector is a Physical quantity and all physical quantities have units. Hence, the vectors also have units, they are called unit vectors.

† A vector can be represented by observing the following steps:

[a ] Draw a line parallel to the direction of vector.

[b ] Cut a length of the line so that it represents the magnitude of the vector on a certain convenient scale.

[c ] Put an arrowhead in the direction of the vector.

[d ] A vector is written with an arrowhead over its Symbol .

★ Unit Vector

A unit vector is a vector having a magnitude of unity. Its only purpose is to describe a direction in space. On x-y co-ordinate system .

Answer 2

Vector quantities are those which have both magnitude and. Direction for e.g. displacement