The electric field inside a uniformly charged thin spherical shell is?

Appeared in: KPSC Staff Nurse - 2015

Explanation

The electric field inside a hollow, uniformly charged spherical shell is always zero.
This is a direct application of Gauss's Law in electrostatics.
A hypothetical 'Gaussian surface' drawn anywhere inside the shell encloses a net charge of zero.
According to Gauss's Law, if the enclosed charge is zero, the net electric flux is zero, which implies the electric field must be zero at all points within that surface.

Option A: This is a non-zero value. The principle of Gauss's Law leads to the conclusion that the field is precisely zero, not a standard unit value like 1.
Option C: This is an arbitrary non-zero value. The electric field inside the shell is always zero, regardless of the amount of charge on the shell or its size.
Option D: This is another arbitrary non-zero value. The principle of a zero field inside a conducting shell is a fundamental concept derived from Gauss's law.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Electric field inside a uniformly charged spherical shell as background academic context rather than a clinical decision trigger.
The principle of zero electric field inside a conductor is the basis for electrostatic shielding.
This concept is applied in Faraday cages, which are enclosures used to block external electric fields.
This is crucial for protecting sensitive electronic equipment, including some medical devices, from electromagnetic interference (EMI) that could cause them to malfunction.

How to Approach the Question

This is a factual recall question from physics.
First, identify the key terms in the question: 'electric field,' 'inside,' and 'uniformly charged thin spherical shell.'
Recall the relevant physical principle for calculating electric fields for symmetric charge distributions, which is Gauss's Law.
To apply the law, visualize an imaginary closed surface (a 'Gaussian surface') inside the physical shell.
Note that all the charge resides on the surface of the shell. Therefore, the charge enclosed by your imaginary surface inside the shell is zero.
Conclude from Gauss's Law that if the enclosed charge is zero, the electric field must also be zero everywhere inside the shell.

Concept Tested & Keywords

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Practise the full KPSC Staff Nurse - 2015

Attempt every question from this paper in a timed mock, then review the full solution for each one.