Oaoo slogan

As can be seen from the title, the angle of particle injection and ejection is 90, that is, 1/4 circle.

Namely:? s？ =0.25*3. 14*r

r？ =? mv/qB

= & gt？ t？ =? 0.25*3. 14*r/v？ =0.25*3. 14*mv/qB？ /v？ =? 3. 14m/4qB

r？ =? 3R/5+4R/5？ =? 7R/5

As can be seen from the figure, O'acb is a square.

Ob=R=Oa

OO'=OO '

That is, o is on the diagonal O'c of the square.

So Of=Oe

Oecf is a square.

That is Oe=ec.

Oe=3R/5

Oa= R

= & gtEa = 4R/5 (Pythagorean theorem)

So r = O 'a = AC = AE+EC = AE+OE = 3r/5+4r/5 = 7r/5.

r？ =? mv/qB？ =? 7R/5？ = & gt？ v？ =? 7qBR/5m