Answer to Question 2

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F = mv2/r and F = Bqv mv2/r = Bqv

mv/r = Bq m = Bqr/v

 

m = 0.920 T 1.60 10-19 C 0.500 m

                   3.00 107 m s-1

 

m = 2.45 10-27 kg (3 s.f.)

 

This is 2700 times the mass of an electron.