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A student starts working on a problem on Gauss' theorem to calculate the flux and hence the…
A student starts working on a problem on Gauss' theorem to calculate the flux and hence the electric field at a given point due to a system of discreet charges. The teacher gives him certain instructions and the student responds to each instruction as per her understanding of the concept. State whether the student's response is correct or incorrect. Give a reason for your answer.
(a)
Examiner: Draw a Gaussian surface for the given system of charges.
Student: Draws a symmetric surface passing through the point at which the electric field is to be calculated.
(b)
Examiner: Suggest a way to double the flux through the given surface.
Student: Doubles the surface area of the Gaussian surface.
(c)
Examiner: Calculate the electric flux of a point charge of $2\ \mu\text{C}$, placed 5 cm above the centre of a square plate of side 10 cm, through the given plate.
Student: As the charge is not enclosed by the surface, the flux through the surface is zero.
Answer
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From ISC 2025 Practice Physics, question 68.