# Concentric shells with potential!

Three concentric, thin, spherical shells having radii $$1 , 2$$ & $$4$$ centimetre are held at potentials $$10, 0$$ & $$40$$ Volts respectively. Taking the origin at the common centre of concentric shells, find the electric field at a distance $$1.25 \text{cm}$$ from origin in Volts per metre.

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