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## Homework Statement

charged particule reaches a uniform magnetic

__field with a velocity__

**B**__, and at angle__

**V***theta*with the magnetic field .

What is the expression of the relation , expressed as a ratio, of the radius and helical step of the trajectory of the particule .

a- 2pi/tan a

b- 2pi tan a

c- 2pi tan a

d- tan a / 2pi

## Homework Equations

r= mv/qb

p = (v cos theta 2 pi m) / qB

F= m * ( v^2 / r )

period = 2pim / qB

ffrquency and angular frequency

qB / 2pim qB / m

## The Attempt at a Solution

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after algebraic manipulations, i ended up with ( m tangent theta / 2 pi ) , so correct answer is D ?

i posted the pic and rewrote retranslated the problem

#### Attachments

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