Question

An electron is projected with velocity in a uniform electric field perpendicular to the field. Again it is projected with velocity perpendicular to a uniform magnetic field . If is initial radius of curvature just after entering in the electric field and is initial radius of curvature just after entering in magnetic field then the ratio is equal to :

A

B

C

D

Hard
Updated on : 2022-09-05
Solution
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Correct option is D)

For electric field,

Refer image 1.

change of electron.

Four due to electric field


where is radius of curvature,



In magnetic field,

Focus on electron

Refer image 2.

Balancing of centripetal and centrifugal focuses,

 




Answer is option

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