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Question

If the electric flux entering and leaving an enclosed surface respectively is ϕ subscript 1 text  and  end text ϕ subscript 2 the electric charge inside the surface will be

  1. open parentheses ϕ subscript 1 plus ϕ subscript 2 close parentheses epsilon subscript 0
  2. open parentheses ϕ subscript 2 minus ϕ subscript 1 close parentheses epsilon subscript 0
  3. open parentheses ϕ subscript 1 plus ϕ subscript 2 close parentheses divided by epsilon subscript 0
  4. open parentheses ϕ subscript 2 minus ϕ subscript 1 close parentheses divided by epsilon subscript 0

The correct answer is: open parentheses ϕ subscript 2 minus ϕ subscript 1 close parentheses epsilon subscript 0

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