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Two infinite parallel metal plates are charged with equal surface charge density of the same polarity. The electric field in the gap between the plates is—
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- The same as that produced by one plate
- Double of the field produced by one plate
- Dependent on coordinates of field point
- Zero
Correct Option: D
For an infinite sheet of charge having surface charge density ρs, the electric field on either side is ρs/ 2∈ and away from it (assuming charge to be positive). Therefore, in the region between the plates, the two fields are antiparallel and equal; and hence the electric field in the gap between the plates is zero. 
