NEET · Physics · STD 12 - 1. Electric charges and fields
If \(\oint_s \vec{E} \cdot \overrightarrow{d S}=0\) over a surface, then:
- A the electric field inside the surface is necessarily uniform.
- B the number of flux lines entering the surface must be equal to the number of flux lines leaving it.
- C the magnitude of electric field on the surface is constant.
- D all the charges must necessarily be inside the surface.
Answer & Solution
Correct Answer
(B) the number of flux lines entering the surface must be equal to the number of flux lines leaving it.
Step-by-step Solution
Detailed explanation
\(\phi_{\text {closed }}=0\) \(\text { So } \phi_{\text {in }}=\phi_{\text {out }}\)
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