A transformer has an input of 6 V and an output of 42 V. If the input is changed to 12 V, the output would be
A) 12 V.
B) 48 V.
C) 84 V.
D) more than 84 V.
E) none of the above
Answer: C
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A narrow copper wire of length L and radius b is attached to a wide copper wire of length L and radius 2b, forming one long wire of length 2L
This long wire is attached to a battery, and a current is flowing through it. If the electric field in the narrow wire is E, the electric field in the wide wire is A) E. B) 2E. C) 4E. D) E/2. E) E/4.
If the potential is given by V = xy - 3 z-2, then the electric field has a y-component of
A) x + y - 6 z-3. B) -y. C) -x. D) x + y. E) cannot be determined
The resistivity of most common metals
A) remains constant over wide temperature ranges. B) increases as the temperature increases. C) decreases as the temperature increases. D) varies randomly as the temperature increases.
The flow of heat in a cold soft drink will be from ______
a. the drink to the ice cubes b. the drink to the outside air c. the drink to the glass d. the ice cubes to the drink