Physics

Problem

A proton moves through a

0.10\,\text{T}

uniform magnetic field with speed

3.0\times10^{6}\,\text{m s}^{-1}

. For what angle

\alpha

between its velocity and the field will the pitch of the resulting helix be exactly equal to the circumference of its circular projection? a)

75^{\circ}

52^{\circ}

45^{\circ}

81^{\circ}