First slide

Electric field

Question

The maximum electric field at a point on the axis of a uniformly charged ring is E₀. At how many points on the axis will the magnitude of the electric field be E₀/2.

Moderate

A

1
B

2
C

3
D

4

Solution

$E = \frac{1}{4 {πε}_{0}} \times \frac{q x}{{(R^{2} + x^{2})}^{\frac{3}{2}}} a n d E i s a n d a t x = \frac{R}{\sqrt{2}}$
Four points as shown.

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