Problem

A tightly wound long solenoid has

n

turns per unit length, radius

r

and carries a current

i

. A particle having charge

q

and mass

m

is projected from a point on the axis in the direction perpendicular to the axis. The maximum speed for which particle does not strike the solenoid will be (a)

\frac{\mu_0 q r n i}{2m}

(b)

\frac{\mu_0 q r n i}{m}

(c)

\frac{2\mu_0 q r n i}{3m}

(d) None of these

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