A charge of 12 C passes through an electroplating apparatus in 2.0 min. What is the average current in the apparatus?
A) 0.10 A
B) 0.60 A
C) 1.0 A
D) 6.0 A
A
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By what primary thermal energy transfer mechanism does the Sun warm Earth?
A) convection B) conduction C) radiation D) All of the above processes are equally important in combination.
Equipotentials are lines along which
a. the electric field is constant in magnitude and direction. b. the electric charge is constant in magnitude and direction. c. maximum work against electrical forces is required to move a charge at constant speed. d. a charge may be moved at constant speed without work against electrical forces. e. charges move by themselves.
Which is more common: a star blows up as a supernova, or a star ejects a planetary nebula?
A) Planetary nebulas are more common. B) Supernovae are more common. C) They both occur in about equal numbers. D) It is impossible to say.
The magnetic field and the number of turns of a coil of wire are doubled, while its area is reduced by a factor of 2. Assuming that all the other parameters remain the same, what happens to the induced emf in that coil of wire?
A) It is doubled. B) It is reduced by a factor of 2. C) It is quadrupled. D) It is reduced by a factor of 4. E) It stays the same.