An electron having kinetic energy 10eV i...

An electron having kinetic energy 10eV is circulating in a path of radius 0.1 m in an external magnetic field of intensity `10^(-4)`T. The speed of the electron will be

`2 xx (10^6) ms^(-1)`

`4.8 xx (10^6) ms^(-1)`

`2.0 xx (10^(12)) ms^(-1)`

`4.8 xx (10^(12)) ms^(-1)`

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