A close surface contains equal and opposite charges. The net electric flux through the close surface is
Correct answer: C. Zero
- A. maximum
- B. minimum
- C. Zero
- D. positive as well as negative
Explanation
The surface has an equal number of positive and negative charges, so the net charge will be zero. Guass's law suggests that Ф = net charge / ∈₀, by using Q = 0, then Ф = 0. Hence, C is the correct option.
This question appeared on the ETEA MDCAT 2006 paper, which you can sit online with every answer explained.
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About Electric Field
An electric field is the force experienced per unit positive test charge, with the field of a point charge given by E = kQ/r² and directed away from positive charges or toward negative charges. Questions involve field lines, superposition and force on a charge, while electric field must be distinguished from electric potential.
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