Consider the following: I. Gravitational field due to a spherical body II. Electrostatic field due to a point charge III. Strong nuclear force field due to a proton IV. Magnetic field due to a bar magnet How many of the above follow the inverse square law?
Three
I. Gravitational field due to a spherical body: It follows the inverse square law. Outside a spherically symmetric body, the gravitational field varies as 1/r2.
II. Electrostatic field due to a point charge: It also follows the inverse square law according to Coulomb’s law, i.e., E ∝ 1/r2.
III. Strong nuclear force field due to a proton: It does not follow the inverse square law. Nuclear force is a very short-range force and its variation with distance is different from 1/r2.
IV. Magnetic field due to a bar magnet: In the elementary magnetic-pole treatment, the field associated with a magnetic pole is taken to obey an inverse square dependence on distance. Hence, this is considered to follow the inverse square law in the context of the question.
Therefore, three of the given cases, namely I, II and IV, follow the inverse square law.
Correct Answer: Three
Similar Questions
Which of the following statements about gravitational force is NOT correct?
Important Questions from Universal law of gravitation
Which of the following is NOT correct ?
Three point masses each of mass m are placed at the three corners of an equilateral triangle of side x. Find the resultant force acting on any one particle at the corner.
Which of the following is NOT correct ?
The force of attraction (F) between two particles having masses m 1and m 2is given by _______. (If r is the distance between them and G is a universal constant)
- Which phenomenon, successfully explained by the universal law of gravitation, relies on the combined and differential gravitational attraction exerted by both the moon and the sun on the earth?
