A 20.0-A circuit breaker protects a 110-V circuit in an intensive care unit. It has four 100-W lights, four 200-W ECG monitors, two 500-W electric beds, and five 25.0-W IV pumps operating on it. Exam 4 – circuit breaker.jpg

If an electron drops from an energy level of 3.4 eV to 1.5 eV, what is the energy of the emitted photon?

What would the resistance be? (Round your answer to one decimal place and include the unit as “Ohms”.)

A proton is moving perpendicular to a magnetic field at 3×106  m/s and experiences a magnetic force of magnitude  4.8×10-13 N. What is the magnitude of the magnetic field?

A voltage of 14 V is placed across a 7 Ω resistor. What is the current in the resistor?

The 3-T bar magnet is broken in half, and the magnetic field around one piece is mapped out. What is wrong with this picture? Exam 4 – broken magnet.png

How are current and charge related?

The magnetism of the Earth acts approximately as if it originates from a huge bar magnet within the Earth. Which of the following statements are true?

Which structure represents the oxaphosphetane reaction intermediate in the scheme below?

Which structure corresponds to the acylpyridinium intermediate A?