An alpha particle (consisting of two protons and two neutrons) is moving in a ci

Question

An alpha particle (consisting of two protons and two neutrons) is moving in a circle at constant speed, perpendicular to a uniform magnetic field applied by some current-carrying coils. The alpha particle makes one clockwise revolution every 78 nanoseconds (see the figure).

If the speed is small compared to the speed of light, what is the numerical magnitude B of the magnetic field made by the coils? What is the direction of this magnetic field?
Proton Mass ? Neutron Mass ? 1.67e-27 kg
Proton Charge = +1.602e-19 C

An alpha particle (consisting of two protons and two neutrons) is moving in a circle at constant speed, perpendicular to a uniform magnetic field applied by some current-carrying coils. The alpha particle makes one clockwise revolution every 78 nanoseconds (see the figure). If the speed is small compared to the speed of light, what is the numerical magnitude B of the magnetic field made by the coils? What is the direction of this magnetic field? Proton Mass ? Neutron Mass ? 1.67e-27 kg Proton Charge = +1.602e-19 C

Explanation / Answer

Used mw=qB and w=2pi/T

There's 4 total proton and neutrons.
(2*pi/78e-9)*(4*1.67e-27)/(2*1.602e-19)

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