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Using Lenz's Law

The ratio of ...

Question

The ratio of amplitudes of radiation emitted by a cylindrical source at distances $2 r$ and $18 r$ from its axis will be

A

1:3

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B

2:1

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C

1:1

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D

9:1

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Solution

The correct option is C 9:1
The intensity is inversely proportional to square of distance and intensity is directly proportional to square of amplitude. So, amplitude is inversely proportional to distance. Answer should be $9 : 1$

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