Discussion
Consider the following statements about Gauss's law.
1. It holds for any closed surface 2. External charge contributes no net flux 3. It gives the field directly whatever the symmetry
Answer: B
Correct answer: 1 and 2 only are correct
Statements 1 and 2 are correct: the law holds for any closed surface whatever, and external charges contribute no net flux. Statement 3 confuses the law with its usefulness - it is always true, but it yields the field only where symmetry lets \( \mathbf{D} \) be taken outside the integral.
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