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Equipotential Surfaces

In a certain ...

Question

In a certain $0.5 c m^{3}$ of space electric potential is found to be $7 V$ throught. What is the electric field in this region?

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Solution

The electric potential in a space is given as

$E = \frac{- d V}{d r}$

Since the velocity is constant throughout the space the differential is zero

Hence the electric field in this region will be

$E = 0$

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