In the figure, the net electric flux through the area $A$ is $\phi=\vec{E} \cdot \vec{A}$ when the system is…

In the figure, the net electric flux
through the area $A$ is $\phi=\vec{E} \cdot \vec{A}$
when the system is in air. On immersing the system in water the net electric flux through the area
  1. becomes zero
  2. remains same
  3. increases
  4. decreases

Solution

(d) Since electric field $\overrightarrow{\mathrm{E}}$ decreases inside water, therefore
flux $\phi=\overrightarrow{\mathrm{E}} . \overrightarrow{\mathrm{A}}$ also decreases. *

Asked in: JEE Mains - Electrostatics - Test 5

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