31: The potential difference across a 4 ohm resistor is 20 volts. Assuming that all of the energy dissipated by this resistor is in the form of heat, how many joules of heat are radiated in 10 seconds?
ANSWER: 1000 JOULESScience Bowl PHYSICS
32 : The force acting between two point charges can be computed using which of the following laws?
w) Ohm's Law
x) Ampere's Law
y) Coulomb's Law
z) Newton's Second Law.
ANSWER: Y -- COULOMB'S LAW
33 : Five volts are applied across the plates of a parallel plate capacitor. The distance of separation of the plates is .02 meters. What is the magnitude of the electric field inside the capacitor?
ANSWER: 250 VOLTS PER METER or 250 NEWTONS PER COULOMB
34 : Used normally, a 150-watt, 120 volt light bulb requires how many amps of current?
ANSWER: 1.25 AMPS
35 : If 10 joules of energy are required to move 5 coulombs of charge between two points, the potential difference between the two points is equal to how many volts?
ANSWER: 2 VOLTS
36 : For a negative point charge, the electric field vectors:
w) circle the charge
x) point radially in toward the charge
y) point radially away from the charge
z) cross at infinity
ANSWER: X -- POINT RADIALLY IN TOWARD THE CHARGE
37: For an infinite sheet of positive charge, the electric field lines:
w) run parallel to the sheet of charge
x) are perpendicular to the sheet of charge and point in toward the sheet
y) are perpendicular to the sheet of charge and point away from the sheet
z) fall off as one over r squared
ANSWER: Y -- ARE PERPENDICULAR TO THE SHEET OF CHARGE AND POINT AWAY
38: Five coulombs of charge are placed on a thin-walled conducting shell. Once the charge has come to rest, the electric potential inside the hollow conducting shell is found to be:
w) zero
x) uniform inside the sphere and equal to the electric potential on the surface of the sphere
y) smaller than the electric potential outside the sphere
z) varying as one over r squared.
ANSWER: X -- UNIFORM INSIDE THE SPHERE AND EQUAL TO THE
39: A two farad and a four farad capacitor are connected in series. What single capacitance is "equivalent" to this combination?
ANSWER: 4/3 FARADSScience Bowl PHYSICS
40: Three capacitors with different capacitances are connected in series. Which of the following statements is TRUE?
w) All three of the capacitors have the same potential difference between their plates.
x) The magnitude of the charge is the same on all of the capacitor plates.
y) The capacitance of the system depends on the voltage applied across the three
capacitors.
ANSWER: -- THE MAGNITUDE OF THE CHARGE IS THE SAME ON ALL OF
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