A Uniform Magnetic Field of 0 $\degree$ B)51 $\degree$ C)44 $\degree$ D)34 $\degree$ E)71 $\degree$

Multiple Choice

A uniform magnetic field of 0.50 T is directed along the positive x axis.A proton moving with a speed of 60 km/s enters this field.The helical path followed by the proton shown has a pitch of 5.0 mm.Determine the angle between the magnetic field and the velocity of the proton.

A) 39 $\degree$
B) 51 $\degree$
C) 44 $\degree$
D) 34 $\degree$
E) 71 $\degree$