Question

The total number of lines of induction leaving a closed surface normally is called

• A. total normal electric field
• B. total normal electric induction
• C. total normal electric potential
• D. total normal electric flux

Answer 1

The correct option is B total normal electric induction

The total number of lines of induction leaving a closed surface normally is called total normal electric induction.
Concept: If $E\cos \theta$ is the component of electric field intensity $E$ parallel to area vector of $dS$ then,

Total normal electric induction through the area $dS=$ Normal electric induction $\times dS$

$(TNEI{)}_{dS}=({\epsilon }_{0}kE\cos \theta )\times dS$

For whole closed surface $S$,

$(TNEI{)}_S=\oint {\epsilon }_{0}k(E\cos \theta ).dS$