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Class 12PhysicsChapter1: Electric Charges and FieldsGauss's Law and its ApplicationsExpertLevel 23
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A point charge is outside a Gaussian surface. It creates field on the surface, yet why is net flux zero?

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Answer and explanation

Correct answer: Lines that enter also leave

Step 1: Field lines from an outside charge can cross the closed surface. Step 2: As many lines enter as leave. Step 3: Entry and exit cancel, giving zero net flux.

Related tags

External ChargeZero Net FluxGaussian Surface

Frequently asked questions

What is the correct answer to this question?

Lines that enter also leave

Why is this the correct answer?

Step 1: Field lines from an outside charge can cross the closed surface. Step 2: As many lines enter as leave. Step 3: Entry and exit cancel, giving zero net flux.

Which subject and chapter does this question cover?

This is a Class 12 Physics question. Chapter: Chapter1: Electric Charges and Fields. Topic: Gauss's Law and its Applications.

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10 more MCQs
  1. 1Why can a neutral conductor also be attracted toward a charged object?
  2. 2In a diagram, the number of electric field lines leaving a closed surface is greater than the number entering it. What does this indicate about the net charge inside?
  3. 3If the same number of electric field lines enter and leave a closed surface, what is the most suitable conclusion about the net charge?
  4. 4If more field lines leave a closed surface than enter it, what does it indicate about the sign of net charge inside?
  5. 5If the same number of field lines enter and leave a closed surface, what is the most suitable conclusion about the net charge?
  6. 6If equal magnitude positive and negative charges are inside a closed surface, must the electric field outside the surface be zero?
  7. 7If fewer electric field lines leave a closed surface than enter it, what is the sign of net charge inside?
  8. 8On what does the net electric flux through a closed surface depend?
  9. 9If the net charge inside a closed surface is zero, what is the net electric flux?
  10. 10If a positive charge is placed inside a closed surface, what is the sign of net electric flux?
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