If two row-boats happen to sail parallel, and close of each other, they experience a force which pulls them towards each other. Give reasons for it.

If apple and earth pull each other with equal force, why does earth not-move towards apple?

Can two streamlins cross each other?

can two isothermal curves intersect each other ?

Explain why electric lines of force donot cross each other.

If vecu and vecv be two vectors parallel to each other then find vecu xx vecv .

Why don't two magnetic lines of force intersect each other ?

Can two streamlines cross each other in a flowing liquid?

Work Problem related to speed, distance and time Places A and B are 70km apart on a highway. A car starts from A and another car start from B at the same time. If they travel in the same direction they meet in seven hours but if they travel towards each other meet in one hour. What are their speed.

(Attempt any ten of the following questions) Define one coulomb charge. Two point charges at a distance r in air exert a force F on each other. At what distance will these charges experience the same force F in a medium of dielectric constant k?