1.

One proton beam enters a magnetic field of \[{{10}^{-4}}\]T normally, Specific charge = \[{{10}^{11}}\,C/kg.\] velocity = \[{{10}^{7}}\,m/s\]. What is the radius of the circle described by it        [DCE 1999]

A.            0.1 m                                       
B.            1 m
C.            10 m                                        
D.            None of these
Answer» C.            10 m                                        


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