A point charge of 40 stat coulomb is placed 2 cm in front of an earthed metallic plane plate of large size. Then the force of attraction on the point charge is

(1) 100 dynes

(2) 160 dynes

(3) 1600 dynes

(4) 400 dynes

Concept Videos :-

#2 | Basic Properties of Charge
#3 | Coulomb's Law Numericals
#4 | Dielectrical Constant
#5 | Principle of Superposition

Concept Questions :-

Coulomb's law

(1)

By the concept of electrical image, the Earth-charge system can be replaced by a system in whichan equal and opposite imaginary charge is placed on other side of the mirror at same distance.

Stats coulomb is the SI unit of charge. Value of K in SI units=1F=40×4042=100dynes  

Difficulty Level:

  • 44%
  • 22%
  • 17%
  • 19%