Topic: Electromagnetics
In which of the following cases the divergence of electric field is zero?
- A. When electric field flows uniform through the tube
- B. When electric field is released from the tube
- C. When electric field is within the closed tube
- D. None of above
Answer: C. When electric field is within the closed tube
Explanation: Divergence of electric field is zero, when the number of electric fields emerging from the tube is equal to incoming field lines. So, the option (c) is correct because all electric field lines are emerging but reside inside the tube.