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Question: how many field lines are leaving the notional boundary above...

Question details

The same pith ball has now been enclosed in the notional boundary shown in Fig.4 Fig. 4

  1. How many field lines are leaving the notional boundary above?  

How many field lines are entering the notional boundary?  

What is the net number of field lines passing through the boundary?

  1. Can you draw a boundary that encloses the charged ball and does not have the same net number of field lines passing through it?
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