PHYSICS XI Ch#2 Quiz 4

As 

Area of parallelogram=(magnitude of A)x(magnitude of B)

Area of parallelogram=3x4

Area of parallelogram=12 units

Following two methods:

1# Scaler product

2# Vector product

As from the characteristics of vector product

Area of parallelogram=product of magnitude of adjacent sides of parallalogram

Scalar product of two vectors obeys only Commutative law.

As Velocity , Electric Field , Momentum have direction so they belong to family of vector quantities.

Space is also called as three dimensional (3D) rectangular coordinate system which consists of three mutually perpendicular axis i.e. x , y, and z-axis. Therefore a vector in space has maximum three components (x-comp, y-comp, z-comp)

Two types of equilibrium

1# Static Equilibrium: When body is at rest

2# Dynamic Equilibrium: When body us moving with uniform vwlocity

In above both types acceleration will zero and when acceleration is zero body is said to be in equilibrium.

When vectors are perpendicular then angle netween them is 90 degree and dot product of two perpendicular vectors is always equal to zero.(cos90=0)

If dot product of two vectors is zero then those vectors are perpendicular to each other.The vector which is perpendicular to F is given computing scaler or dot product

(4i-3j).(7k)=28(i.k)-21(j.k)

=28(0)-21(0)

=0