H2 Physics · JC 2 · Medium · Deflection of charged beams
An alpha particle (charge +2e, mass 6.6×10−27kg) moves in a circle of radius 0.12m in a uniform magnetic field of flux density 0.30T. Its speed is 4.0×106m s−1. What is the magnitude of the magnetic force on the particle?
3.8×10−13N
1.9×10−13N
7.6×10−13N
1.1×10−12N
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