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CBSE Class 12 Physics 2023 Outside Delhi Set 2 Paper

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Question : 3
Total: 13
An isolated point charge particle produces an electric filed
→
E
 at a point 3m away from it. The distance of the point at which the filed is ‌
→
E
4
 will be
Solution:     👈: Video Solution
E=‌
1
4πε0
‌
q
r2
In 1‌st ‌ case,
E=‌
1
4πε0
‌
q
32
=‌
1
4πε0
‌
q
9
 .......(1)
In 2‌nd ‌ case,
‌
E
4
=‌
1
4πε0
‌
q
r2
 ......(2)
Taking ratio,
‌4=‌
r2
9
∴‌r=6m
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