An economic problem generally means the problem of making choices which occurs because of the scarcity of resources. The economic problem arises because people have unlimited desires but the means to satisfy that desire is limited. Therefore, satisfying all human needs are difficult with limited means.

Causes of Economic Problem

• Scarcity of Resources- Resources like labor, land, and capital, etc. are insufficient as compared to the demand. Therefore, the economy cannot provide everything that people want.
• Unlimited Human Wants- Human beings demands and wants are unlimited and never ends, which means they will never be satisfied. If a person one wants is satisfied, they will start tempting some new desires. People wants are unlimited and keep multiplying, therefore, cannot be satisfied because of limited resources.
• Alternative Uses- Resources being scared they are put into different uses. So, to make a choice among resources are essential. For instance, petrol is not only used in a vehicle but it is also used for generator, running machine, etc. So, now the economy should make a choice within the alternative uses.

Forces between multiple charges –Superposition principle

As per the principle of superposition, the force on any charge due to a number of other charges is the vector sum of all the forces on that charge due to other charges, taken one at a time.

Forces between multiple charges –Superposition principle

As per the principle of superposition, the force on any charge due to a number of other charges is the vector sum of all the forces on that charge due to other charges, taken one at a time.

Semple identifies four key ways that the physical environment:
1) direct physical effects (climate, altitude);
2) psychical effects (culture, art, religion);
3) economic and social development (resources and livelihoods);
4) movement of people (natural barriers and routes, such as mountains and rivers).

An electrophilic substitution reaction is a chemical reaction in which the functional group attached to a compound is replaced by an electrophile. The displaced functional group is typically a hydrogen atom. Electrophilic substitution reactions generally proceed via a three-step mechanism that involves the following steps.

• The generation of an electrophile
• The formation of a carbocation (which is an intermediate)
• The removal of a proton from the intermediate

Area vector is a vector whose magnitude is equal to the area and is directed normal to the surface.

Area as such is a scalar. So, Area vector is defined as above for use in calculations and defining some other terms like torque on a current carrying loop in a magnetic field etc.

types of element=2 

no of element=3*3=9

no.possible matrix=2^{9  ₌₅₁₂}

2^{9 ₌₅₁₂}

The various features of Harrappan culture are given below:

1. This civilization is extended far beyond the Indus Valley. The main towns of Indus valley civilization were Harappa, Mohenjo-Daro, Kalibangan, Lothal.

2. The significant features of Indus Valley civilization are personal cleanliness, town planning, construction of burnt-brick houses, ceramics, casting, forging of metals, manufacturing of cotton and woolen textiles.

3. Mohenjo-Daro people had finest bath facilities, drainage system, and knowledge of personal hygiene.

4. They were equally conscious of plant medicine since there was occasional warfare.

5. The town planning and other characteristics indicate that a homogeneous indigenous culture developed.

6. The portrayal of a three-faced figure surrounded by various animals has been considered as Shiva in the form of Pasupati or Brahma, the originator of Brahmi School of learning.

7. The seal has been available in the stupa area that is generally believed as college area. Computer study of the available seals has been started in different centers.

8. The naksatras are of Harappan origin and these are related to later Dravidian names.

9. Application of decimal scale in linear measure is another very important achievement of the Harappans.

10. They had perhaps a fairly good idea of lunar astronomy, as envisaged from some of the seals since they were very much attached to navigation and fire worship as found in Kalibangan.

11. The rectangular bath at each of the Harappan sites was considered a holy place.

12. The Harappan people could prepare painted potteries of burnt clay, glazed potteries faience, terracotta, etc. The glazing of potteries is believed to be of Indian origin.

13. The cities were supported by both trade and agriculture. The foundations of well-planned shipyards at Kalibangan and Lothal and granaries at all these main Harappan sites indicate how important they were in the economy of that time.

14. Certain medicated and contemplative postures of the people, available among terracotta figurines suggest that they also developed the science of physical and mental discipline to a high degree.

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The electrical potential difference is defined as the amount of work done to carrying a unit charge from one point to another in an electric field. In other words, the potential difference is defined as the difference in the electric potential of the two charged bodies.