A Proton,starting from Rest,accelerates Through a Potential Difference of 1 $\vec { B }$

question 74

Multiple Choice

A proton,starting from rest,accelerates through a potential difference of 1.0 kV and then moves into a magnetic field of 0.040 T at a right angle to the $\vec { B }$ field.What is the radius of the proton's resulting orbit? (e = 1.60 × 10^-19 C,m_proton = 1.67 × 10^-27 kg)

• A)0.080 m
• B)0.11 m
• C)0.14 m
• D)0.17 m

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