Physics GRE 1777 Solutions Mohamed Abdelhafez [email protected] I keep on seeing people either unaware that there are practice tests or that are unable to find them. One of the equations to know for the GRE is the magnetic eld of a current loop at the center can be derived from Biot-Savart Law B center= 0I 2R. 21EM Magnetic Force Answer E For cyclotrons, mv2 R = qvB =m!= qB, so != qB m. For a proton, q = e, m = m p. For a deutron, q = e, m = 2m p. For an alpha particle, q = 2e, m = 4m p. Therefore, ! p ! d ! = 1 1 2 1 2
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