Question

21. (a)
State Coulomb's law in electrostatics. Write it in its vector form. What is
the importance of expressing it in vector form?
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Answer 1

Answer:

Area Of Sector

It consists of a region bounded by two radii and an arc lying between the radii. The area of a sector is a fraction of the area of the circle. This area is proportional to the central angle. In other words, the bigger the central angle, the larger is the area of the sector