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Q.

A cyclotron is used to obtain 2 MeV protons. If the frequency is 5MHz and potential is 20kV. the magnetic field necessary for resonance is

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a

0.528T

b

0.389T

c

2.32T

d

0.327T

answer is B.

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Detailed Solution

f=Bq2πm;5×106=B×1.6×10−192π×1.6×10−27
B = 0.327T

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