A proton and an alpha particle enter a uniform magnetic field perpendicular to their velocity, both with the same speed. The proton completes 5 revolutions in 25 µ s. What is the periodic time for the alpha particle?

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The period of a charged particle moving in a circle inside a magnetic field is $T = \dfrac{2\pi m}{qB}$ , which depends only on the mass-to-charge ratio of the particle, not on its speed.

A proton and an alpha particle enter a uniform magnetic field perpendicular to their velocity, both with the same speed. The proton completes 5 revolutions in $25\ \mu s$ . What is the periodic time for the alpha particle?

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← The cyclotron frequency of an electron gyrating in a uniform magnetic field of magnitude 1 T is approximately Two long parallel conductors separated by a distance d carry currents I₁ and I₂ in the same direction, and exert an attractive force F on each other. Now the current in one conductor is doubled and its direction reversed, while the separation is increased to 3d. What is the new force between the conductors (taking attractive as positive)? →

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