A Proton Is Accelerated from Rest Through a Potential Difference

question 21

Multiple Choice

A proton is accelerated from rest through a potential difference of 150 V. It then enters a region of uniform magnetic field and moves in a circular path (radius = 12 cm) . What is the magnitude of the magnetic field in this region?

• A) 18 mT
• B) 12 mT
• C) 15 mT
• D) 22 mT
• E) 10 mT

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