Question 862: Electrostats & Capacitance

Question

The charges $$2 \mathrm{q},-\mathrm{q},-\mathrm{q}$$ are located at the vertices of an equilateral triangle. At the circumcentre of the triangle

Accepted Answer

From charge configuration, at the centre electric field is non-zero.
Potential at the centre due to $$2 \mathrm{q}$$ charge $$\mathrm{V}_{2 \mathrm{q}}=\frac{2 \mathrm{q}}{\mathrm{r}}$$ and potential due to $$-\mathrm{q}$$ charge
$$\mathrm{V}_{-\mathrm{q}}=-\frac{\mathrm{q}}{\mathrm{r}} \quad(\mathrm{r}=$$ distance of centre point)
$$	herefore \quad$$ total potential $$\mathrm{V}=\mathrm{V}_{2 \mathrm{q}}+\mathrm{V}_{-\mathrm{q}}+\mathrm{V}_{-\mathrm{q}}=0$$

Answer

the field is zero but potential is not zero.

Answer

the field is non-zero but the potential is zero.

Answer

both, field and potential are zero.

Answer

both. field and potential are non-zero.

Electrostats & Capacitance

The charges $2 \mathrm{q},-\mathrm{q},-\mathrm{q}$ are located at the vertices of an equilateral triangle. At the circumcentre of the triangle

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