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Standard XII
Physics
Cyclotron
Question

In a cyclotron, a charged particle
  1. undergoes acceleration all the time.
  2. speeds up between the dees because of the magnetic field.
  3. speeds up in a dee
  4. slows down within a dee and speeds up between dees.

A
speeds up between the dees because of the magnetic field.
B
speeds up in a dee
C
undergoes acceleration all the time.
D
slows down within a dee and speeds up between dees.
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Solution
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In a cyclotron, charged particle experiences coulombic force(force due to electric field) between the Dees and magnetic force ( force due to magnetic field ) while circulating inside the Dees. In total, it always experiences a force.

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A cyclotron with two cylindrical dees (shapes of D ), as shown in the figure, is used to accelerate proton of mass m=1.6×10−27kg and charge 1.6×10−19C by applying a potential difference of 100kV between the dees. A magnetic field of 1T is applied normal to the plane of dees of maximum radius of 50cm. The number of revolutions made by the protons just before coming out of the cyclotron will be about whenever a protons leaves one of the dees , other will kept at proper polarity, is
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Q2
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Q3
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Q4
Estimate the kinetic energy gained by a proton in one revolution if the potential gap between the Dees is 80 kV in a cyclotron.
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