If a bar magnet is falling through a loop of wire, the induced current in the loop of wire sets up a field which exerts a force on the magnet. This force between the magnet and the loop will be repulsive when:
a. the magnet enters the loop.
c. never.
b. the magnet is leaving the loop.
d. the magnet is halfway through.
A
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Some of Earth's rocks retain traces of the magnetic field that point backward to its field today
a. True b. False Indicate whether the statement is true or false
A hydrogen atom is in its n = 2 excited state when its electron absorbs a photon of energy . What is the energy of the resulting free electron? The lowest level energy state of hydrogen is -13.6 eV. (h = 6.626 × 10-34 J ? s, 1 eV = 1.60 × 10-19 J)
A) 5.1 eV B) 6.6 eV C) 6.9 eV D) 7.7 eV
A student walks 1.0 mi west and then 1.0 mile north, after ward how far is she from her starting point?
A 1.0 mi B 1.4 mi C 1.6 mi D 2.0 Mi
The electric potential at two points in space is: V1 = 200 volts and V2 = 300 volts. Which of the following statements is true for moving a point charge q from point 1 to 2?
A. The work done by an external agent to move q from point 1 to 2 is positive. B. We can't determine the work done because we don't know the direction of V at the two points. C. The work done by the electric force exerted on q in moving it from point 1 to 2 is W = –q(100 V).
1.A 2.B 3.C 4.A and B 5.A and C 6.B and C 7.A, B, and C 8.None of the above