It is a common pratice to plant tree and shrubs near the boundary walls of building. What purpose do they serve?

A small resistor is usually put in a parallel t the current carrying coil of an electromagnet as shown in the figure. What purpose does it serve?

It is common pratice to undertake desilting of overhead water tanks. What is possible source of silt that gets deposited in the water tanks?

What is difference between the stems of shrub nad tree?

A pole has to be erected at a point on the boundary of a circular park of diameter 13 metres in such a way that the differences of its distances from two diametrically opposite fixed gates A and B on the boundary is 7 metres. Is it possible to do so ? If yes, at what distances from the two gates should the pole be erected ?

The Class X students of a secondary school in Krishinagar have been allotted a rectangular plot of land for their gardening activity. Sapling of Gulmohar are planted on the boundary at a distance of lm from each other. There is a triangular grassy lawn in the plot as shown in the Fig. The students are to sow seeds of flowering plants on the remaining area of the plot.:- Taking A as origin find the coordinates of the vertices of triangle .What will be the coordinates of the vertices of triangle PQR if C is the origin ? Also calculate the areas of the triangles in these cases. What do you observe ?

Consider a coin, It is electrically neutral and contains equal amounts of positive and negative charge of magnitude 34.8 kC . Suppose that these equal charages were concentrated two point charges separated by 100 m(-length of a long building),find the force on each such point charge in this case. What do you conclude from these results?