First slide

Electric field

Question

A uniformly charged ring of radius 15 cm carries a total charge 60 µC. Where should a point charge 3 µC be kept on the axis of the ring so that it experiences maximum force?

Easy

A

15 cm from the centre
B

13.8 cm from the centre
C

10.6 cm from the centre
D

7.5 cm from the centre

Solution

On the axis of a ring, the electric field is maximum at
$x = \frac{R}{\sqrt{2}} = \frac{15 cm}{\sqrt{2}} = 10.6 cm$

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