Electric vs. Gravitational Shielding – Rankers Physics

Properties of Charges: Practice Problem & Solution

Assertion (A): We can shield a charge from electric fields by putting it inside a hollow conductor but we can not shield a body from the gravitational influence of near by matter by putting it inside a hollow sphere. Reason (R): Gravitational force in between two point mass bodies is independent of the intervening medium them.  
Both (A) & (R) are true and the (R) is the correct explanation of the (A)
Both (A) & (R) are true but the (R) is not the correct explanation of the (A)
(A) is true but (R) is false
Both (A) and (R) are false

Short Solution (Best for NEET):

To solve this problem, we apply the core principles of Properties of Charges. Understanding the underlying formula is key to arriving at the correct answer below:

Assertion (A) is true: Electrostatic shielding (Faraday cage) works, but gravitational shielding does not. Reason (R) is true: Gravitational force is a fundamental interaction that is unaffected by the medium. (R) correctly explains (A) as electric fields can be screened by charge redistribution in conductors, a mechanism not available for gravity.

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Similar Practice Questions

Explore conceptually related problems to test your knowledge.

1. Two metallic spheres carry equal charges. The distance between the spheres cannot be considered large in comparison with the diameters of the spheres. In which case, will the force of interaction between the spheres be greater ?
2. Assertion (A): A charged particle is free to move in an electric field. It may or may not move along an electric line of force. Reason (R): Initial conditions affect the motion of charged particle.  
3. An electric dipole consisting of two opposite charges of \( 2 \times 10^{-6}\text{ C} \) each separated by a distance of 3 cm is placed in an electric field of \( 2 \times 10^5\text{ N/C} \). The maximum torque on the dipole will be:
4. Assertion (A): The tyres of aeroplanes are slightly conducting. Reason (R): During take off and landing of aeroplanes, the friction between tyres and the runway may cause electrification of tyres.  
5. An electric dipole has the magnitude of its charge as \(q\) and its dipole moment is \(p\). It is placed in a uniform electric field \(E\). If its dipole moment is along the direction of the field, the force on it and its potential energy are respectively: