An electron (mass =9xx10^(-31)kg. Charge...

An electron (mass `=9xx10^(-31)kg`. Charge `=1.6xx10^(-19)C)` whose kinetic energy is `7.2xx10^(-18)` joule is moving in a circular orbit in a magnetic field of `9xx10^(-5) "weber"//m`. The radius of the orbit is

`1.25cm`

`2.5cm`

`12.5cm`

`25.0cm`

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