Three large non conducting plane sheet of charge
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Explanation:
The electric charge densities are σ,−2σ and 4σ respectively.
Hence, electric field at point P is given by
Ep = σ / 2ϵ0 + -2 σ / 2ϵ0 + 4σ / 2ϵ0
= (σ - 2σ + 4σ) / 2ϵ0
= 3σ / 2ϵ0
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