Thomson is best known for his discoveries about the nature of cathode rays.

m

q

The spectrometer consists of two regions as shown in the figure.() In the first region an electric field accelerates the ion and in the second the ion follows a circular arc in a magnetic field. The radius of curvature of the arc can be measured and then the m/q

 ratio can be found.

After being accelerated to a speed of 1.09×105 m/s

 , the particle enters a uniform magnetic field of strength 0.900 T

 and travels in a circle of radius 31.0 cm

 (determined by observing where it hits the screen as shown in the figure). The results of this experiment allow one to find m/q

.

Find the ratio m/q

 for this particle.

Express your answer numerically in kilograms per coulomb.

#16 for my reference