The ratio of time period is **4:3**

**Explanation:**

The time for the charged particle to go around the circular path is the period.

T = Circumference/Speed

Where r is radius of curvature of the moving charge q,

m is the mass and

v is the velocity of the charged particle and

B is magnetic field.

**T**_{1}/ T_{2} = (2πm_{1}/q_{1}B) / (2πm_{2}/q_{2} B) = m_{1}q_{2} / m_{2}q_{1} = 2 x 2 / 3x1 = 4 : 3