According to Coulomb's law, the electrostatic force between two fixed point charges in free space varies with distance as:
Inversely proportional to the square of distance
Coulomb's law states that the electrostatic force between two point charges is given by \(F = \dfrac{1}{4\pi\varepsilon_0}\dfrac{q_1 q_2}{r^2}\), where \(r\) is the distance between the charges.
This shows that the force is directly proportional to the product of the charges and inversely proportional to the square of the distance between them.
The force can be attractive or repulsive depending on the nature of the charges, and it does depend on the medium through the permittivity term, so those options do not hold.
Therefore, the electrostatic force varies as inversely proportional to the square of distance.
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Important Questions from Current Electricity
- In a parallel combination of resistors, which of the following quantities remains the same across all the resistors?
- Which of the following statements is/are true for a domestic circuit?
(i) All the appliances are connected in parallel.
(ii) The live wire in the domestic circuit has green insulation on it.
(iii) A fuse connected to the circuit allows excessive current to pass through the appliances.
(iv) The neutral wire in the domestic circuits has black insulation on it. A science teacher asks students to measure the current through a bulb using an ammeter. What precaution must the students follow?
- Which characteristic of parallel circuits makes them advantageous over series circuits for connecting multiple electrical gadgets in a house?
- In a domestic electric circuit, the main purpose of a FUSE is ________.
