An alpha particle has a mass of
7.43 × 10−27 kg and bears a double elemen-
tary positive charge. Such a particle is ob-
served to move through a 5.8 T magnetic field
along a circular path of radius 0.17 m.
The charge on a proton is 1.60218×10−19 C.
What speed does it have?

Please help me!!!!!!!!!!!!!!!!!!!!!!!!!

Question

An alpha particle has a mass of
7.43 × 10−27 kg and bears a double elemen-
tary positive charge. Such a particle is ob-
served to move through a 5.8 T magnetic field
along a circular path of radius 0.17 m.
The charge on a proton is 1.60218×10−19 C.
What speed does it have?

Please help me!!!!!!!!!!!!!!!!!!!!!!!!!

anonymous · Answer

The charge follows circular path at constant speed. We can apply uniform circular motion ideas: 
F = mv2/r
force applied on charge moving in magnetic feild
F = qvB