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Class 12 Physics Practice Test: Motion in Combined Electric and Magnetic Field
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Class 12 Physics Practice Test: Motion in Combined Electric and Magnetic Field
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10 Questions

1. A chamber is maintained at a uniform magnetic field of 5 × 10-3 T. An electron with a speed of 5 × 107 ms-1 enters the chamber in a direction normal to the field. Calculate the radius of the path.
2. Calculate the speed of an electron if it travels in a circular path of radius 50 cm in a magnetic field of 5 × 10-3 T.
3. A cyclotron has an oscillatory frequency of 12 MHz and a dee radius of 50 cm. Calculate the magnetic field required to accelerate deuterons of mass 3.3 × 10-27 Kg and charge 1.6 × 10-19 C.
4. In a cyclotron, a magnetic induction of 1.4 T is used to accelerate protons. How rapidly should the electric field between the dees be reversed?
5. If an electron entering at a magnetic field of 2 × 10-2 T has a velocity of 3 × 107 ms-1 and describes a circle of radius 8 × 10-3 m, then find the value of \(\frac {e}{m}\) of the electron.
6. A cyclotron has an oscillatory frequency of 12 MHz and a dee radius of 50 cm. Calculate the magnetic field required to accelerate deuterons of mass 3.3 × 10-27 Kg and charge 1.6 × 10-19 C.
7. Which of the following particles cannot be accelerated using a cyclotron?
8. In a cyclotron, a magnetic induction of 1.4 T is used to accelerate protons. How rapidly should the electric field between the dees be reversed?
9. A chamber is maintained at a uniform magnetic field of 5 × 10-3 T. An electron with a speed of 5 × 107 ms-1 enters the chamber in a direction normal to the field. Calculate the radius of the path.
10. What should be the minimum magnitude of the magnetic field that must be produced at the equator of earth so that a proton may go round the earth with a speed of 1 × 107 ms-1? Earth’s radius is 6.4 × 106 m.

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