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An electron is projected at an angle the...

An electron is projected at an angle `theta` with a uniform magnetic field. If the pitch of the helical path is equal to its radius, then the angle of projection is

A

`tan^-1 pi`

B

`tan^-1 2pi`

C

`cot^-1 pi`

D

`cot^-1 2pi`

Text Solution

Verified by Experts

The correct Answer is:
b
`r=(mvsin theta)/(qB)`, Pitch: `p=v cos thetaT =v cos theta(2pim)/(qB)`
Now, `p=r`, solve to get `theta=tan^-1 2pi`
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