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A 10 eV electron circulating in a plane ...

A 10 eV electron circulating in a plane at right angle to a uniform field of magnetic induction `10^(-4) Wb//m^(2)` `(=1.0"gauss")`. The orbital radus of electron is

A

11cm

B

18 cm

C

12 cm

D

15 cm

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The correct Answer is:
A
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