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The radius of the path of an electron in...

The radius of the path of an electron inoving at a speed of `3 xx 10^(7)' m"/"s` perpendicular to a magnetic field 5 x 10-4T is nearly

A

15cm

B

45cm

C

27cm

D

34cm

Text Solution

Verified by Experts

The correct Answer is:
D
When an electron moves perpendicular to magnetic field , the radius r of circular path traced by electron is
`r-(mv)/(eB)=((9.1xx10^(-31)kg)(3xx10^(-7)ms^(-1)))/((1.6xx10^(-19)C)(5xx10^(-4)T))`
`=3.4xx10^(-1)m=34cm`
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