An electron having charge `1.6xx10^(-19)C` and mass `9xx10^(-31)` kg is moving with `4xx10^(6)ms^(-1)` speed in a magnetic field `2xx10^(-1)` tesla in circular orbit. The force acting on electron and the radius of the circular orbit will beA. `12.8xx10^(-13)B,11xx10^(-3)m`B. `1.28 xx10^(-14)N, 11xx10^(-3)m`C. `12.8xx10^(-13)N,11xx10^(-3)m`D. `1.28xx10^(-13)N,11xx10^(-4)m`

An electron having charge `1.6xx10^(-19)C` and mass `9xx10^(-31)` kg i

1.	An electron having charge `1.6xx10^(-19)C` and mass `9xx10^(-31)` kg is moving with `4xx10^(6)ms^(-1)` speed in a magnetic field `2xx10^(-1)` tesla in circular orbit. The force acting on electron and the radius of the circular orbit will beA. `12.8xx10^(-13)B,11xx10^(-3)m`B. `1.28 xx10^(-14)N, 11xx10^(-3)m`C. `12.8xx10^(-13)N,11xx10^(-3)m`D. `1.28xx10^(-13)N,11xx10^(-4)m`
Answer» Correct Answer - D Force F=evB `=1.6xx10^(-19)xx4xx10^(6)xx2xx10^(-1)` `=12.8 xx10^(-13)N` Radius of circular orbit `r=(mv)/(Bq)` `=(9xx10^(-31)xx4xx10^(6))/(2xx10^(-1)xx1.6xx10^(-19))` lt `=1.1xx10^(-4)`

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