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1. A 42-cm-long solenoid, 1.8 cm in diameter, is to produce a 0.030-T magnetic field at...

1. A 42-cm-long solenoid, 1.8 cm in diameter, is to produce a 0.030-T magnetic field at its center. If the maximum current is 5.5 A , how many turns must the solenoid have?

2. A 4.5-MeVMeV (kinetic energy) proton enters a 0.28-TT field, in a plane perpendicular to the field. What is the radius of its path?

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