Q.

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.

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a

1

b

2

c

3

d

4

answer is D.

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Detailed Solution

E=14πε0×qxR2+x232 and E is and  at x=R2Four points as shown.
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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.