Answer
397.5k+ views
Hint: Magnetic flux is the number of the magnetic field passing through a closed surface. The measurement of the magnetic field actually provides the total magnetic field that passes through a given surface area.
Complete step by step answer:
Case 1:
Since nothing is mentioned about the presence of any magnetic field producing element inside the surfaces, even if we consider C to be a closed boundary we know that that \[\phi = \oint {\overrightarrow {B.} } \overrightarrow {dS} \] but without the presence of any magnetic field producing element within the closed surface we get $\overrightarrow B = 0$ and hence the value of flux = 0
\[{{{\theta }}_{{S_1}}} = {{{\theta }}_{{S_2}}} = 0\]
Case 2:
Now we consider that some flux is entering through the opening which is being shared by both the surfaces $S_1$ and $S_2$ we can notice that,
The flux that is passing through C and going through surface $S_2$ will also pass through surface $S_1$ so the flux passing through both surfaces is the same and equals net flux entering through their common circular boundary.
If we start from calculating the flux coming to $S_1$ then also we can notice that whatever the amount of flux is coming to $S_1$ that flux has come from nowhere else but the surface $S_2$. So by this approach also we can conclude that net flux passing through both the surfaces will be equal.
\[{{{\theta }}_{{S_1}}} = {{{\theta }}_{{S_2}}} = 0\]
Hence, the correct answer is option (D).
Note: In order to tackle such kinds of questions one should have understanding knowledge of the various terms involved and the application of Gauss's law. Students should have to practice a lot of numerical problems based on the application of Gauss law to master the concept behind the problems.
Complete step by step answer:
![seo images](https://www.vedantu.com/question-sets/a09a41dd-95bc-4c68-9462-01bb94b589a44517336474519267864.png)
Case 1:
Since nothing is mentioned about the presence of any magnetic field producing element inside the surfaces, even if we consider C to be a closed boundary we know that that \[\phi = \oint {\overrightarrow {B.} } \overrightarrow {dS} \] but without the presence of any magnetic field producing element within the closed surface we get $\overrightarrow B = 0$ and hence the value of flux = 0
\[{{{\theta }}_{{S_1}}} = {{{\theta }}_{{S_2}}} = 0\]
Case 2:
Now we consider that some flux is entering through the opening which is being shared by both the surfaces $S_1$ and $S_2$ we can notice that,
The flux that is passing through C and going through surface $S_2$ will also pass through surface $S_1$ so the flux passing through both surfaces is the same and equals net flux entering through their common circular boundary.
If we start from calculating the flux coming to $S_1$ then also we can notice that whatever the amount of flux is coming to $S_1$ that flux has come from nowhere else but the surface $S_2$. So by this approach also we can conclude that net flux passing through both the surfaces will be equal.
\[{{{\theta }}_{{S_1}}} = {{{\theta }}_{{S_2}}} = 0\]
Hence, the correct answer is option (D).
Note: In order to tackle such kinds of questions one should have understanding knowledge of the various terms involved and the application of Gauss's law. Students should have to practice a lot of numerical problems based on the application of Gauss law to master the concept behind the problems.
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