Q9 of 9 Page 46

State the limitation of Coulomb's law of electrostatics

Coulomb's law of electrostatics has the following limitations:

• It is only valid for the charges at rest. If a charges is in motion Coulomb's law of electrostatics


• The Coulomb’s Law is applied to the point. If charged bodies are of finite size such that they can’t be regarded as a point charge then Coulomb’s Law is not valid .


More from this chapter

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5

The electric field at 2R from the centre of a uniformly charged non-conducting sphere of radius R is E. The electric field at a distance R/2 from the centre will be

(a) Zero


(b) 2E


(c) 4E


(d) 16E

6

Consider three charges q1, q2, q3 each equal to q at the vertices of an equilateral triangle of side l. What is the force on a charge Q (with the same sign as q) placed at the centroid of the triangle?

 7

2 point charges of +16 μC and –9 μC are placed 8 cm apart in air. The Determine the position of the point where resultant electric field is 0 (zero)

 8

Determine the total charge on 75 kg of electrons