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Electric Potential at a Point in Space Due to a Point Charge Q

The ratio of ...

Question

The ratio of electric field intensity at distance 5 cm to that at 10 cm from a point charge 5 Q in air is:

A

2 : 1

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B

1 : 2

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C

1 : 4

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D

4 : 1

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Solution

The correct option is D 4 : 1
${\to E}_{1}$ at 5 cm $= k \frac{5 Q}{5^{2}} = 4 : 1$

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