A proton (charge e, mass 1u), traveling perpendicular to a magnetic field, experiences the same force as an alpha particle (charge 2e, mass 4u) which is also traveling perpendicular to the same field. The ratio of their speeds, vproton/valpha is:
A) 0.5 B) 1 C) 2 D) 4 E) 8
The figure shows a uniform, 3.0-T magnetic field that is normal to the plane of a conducting, one turn circular loop with a resistance of 1.5 Ω and a radius of 0.024 m. The magnetic field is directed out of the paper as shown. Note: The area of the non-circular portion of the wire is considered negligible compared to that of the circular loop.
If the magnetic field is decreased to zero in 0.2 s, at what rate is energy dissipated in R?
A) 1.8 × 10-2 W B) 3.6 × 10-2 W C) 3.8 × 10-3 W D) 2.7 × 10-4 W E) 4.9 × 10-4 W
Two coils, 1 and 2, are positioned as shown in the figure. Coil 1 is part of a circuit with a battery and a switch. Assume that S has been closed for a long time. Which one of the following statements is true if S is suddenly opened?
A) There is no induced current through R.
B) There is no induced magnetic field in coil 2.
C) There is an induced current in R that flows from right to left.
D) There is an induced magnetic field in coil 2 that points toward C.
E) There is an induced magnetic field in coil 2 that points toward B.
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