Two thick plates having same charges (same charge density σ) are placed side by side. Consider the case of infinite plate. Find the difference between the electric field present between the plate and remaining space of the plate, (ε=permittivity)
A
σε
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B
2σε
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C
σ2ε
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D
0
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Solution
The correct option is Aσε The left plate produces a field (σ2ϵ0) which points away from it to the left in the region (i) and to the right in region (ii) and (iii). The right plate being negatively charged, produces a field (σ2ϵ0) which points towards it to the right in regions (i) and (ii) and to the left in the region (iii). The 2 fields cancel in region (i) and (iii); they add in region (ii). Thus the field between the plates is σε0 and elsewhere, 0.