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An electric field due to a positively ch...

An electric field due to a positively charged long straight wire at a distance r from it is proportional to `r_(-1)` in magnitude. Two electrons are orbiting such a long straight wire in circular orbits of radii `1 Å` and `2 Å`. The ratio of their respective time periods is

A

`1:1`

B

`1:2`

C

`2:1`

D

`4:1`

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The correct Answer is:
B
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