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High school physical magnetic field
According to the meaning of the question, if the trajectory of a particle in a magnetic field is a semicircle, then AD=2r. (Not counting the gravity of particles), expressed by Uq= 1/2mv? , know the speed v of entering the magnetic field, and then know its r from the formula r=mv/qB, and deduce the AD. Because the semicircle moves in the magnetic field, the movement time is 1/2T=πm/qB, and the movement time can be obtained.
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