One of the First Cyclotrons,built by Lawrence and Livingston in the 1930's,accelerated

question 14

Multiple Choice

One of the first cyclotrons,built by Lawrence and Livingston in the 1930's,accelerated protons circles in the space between two magnetic poles.The magnetic poles were shaped like flat disks with a diameter of 25 cm and the magnetic field between the plates was uniform and oriented perpendicular to the plates.The plates and proton trajectories were horizontal.The plates were parallel to each other and separated by 5 cm.The protons started traveling slowly in small circles at the center of the disks,and would begin making larger and larger circles,travelling faster and faster,until they left the region between the plates.When the protons left the magnetic region at the edge of the plates,they were travelling at 1.2 *10⁷ m/s.What was the magnetic field between the plates?

• A)0.50 T
• B)0.75 T
• C)1.0 T
• D)1.25 T
• E)1.5 T

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