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41: For a parallel-plate capacitor with plate area "A" and plate separation "d", the capacitance is proportional to which of the following?
x) A times d
y) A divided by d
z) d divided by A
ANSWER: Y -- A DIVIDED BY D
42: A constant potential difference is applied across the plates of a parallel-plate capacitor. Neglecting any edge effects, the electric field inside the capacitor is:
w) constant
x) varying as one over r squared
y) decreasing as one moves from the positive to the negative plate
z) zero
ANSWER: W -- CONSTANT
43: A 10 farad capacitor is used in a circuit. The voltage difference between the plates of the capacitor is 20 volts. What is the magnitude of the charge on each of the capacitor's plates?
ANSWER: 200 COULOMBS
44: A circuit which employs a DIRECT CURRENT source has a branch which contains a capacitor. After the circuit has reached a steady state, what is the magnitude of the current in the circuit branch which contains the capacitor?
ANSWER: THE CURRENT IS ZEROScience Bowl PHYSICS
45: A charged particle is moving in a UNIFORM magnetic field. If the direction of motion of the charged particle is parallel to the magnetic field, describe the shape of the charged particle's path.
ANSWER: STRAIGHT LINE
46: An infinitely long wire carries a current of three amps. The magnetic field outside the wire:
w) points radially away from the wire
x) points radially inward
y) circles the wire
z) is zero.
ANSWER: Y -- CIRCLES THE WIRE
47: A copper rod which is 1 centimeter in diameter carries a current of 5 amps. The current is istributed uniformly throughout the rod. The magnetic field half way between the axis of the rod and its outside edge is:
w) zero.
x) pointing radially outward
y) pointing radially inward
z) circles the axis of the rod
ANSWER: Z -- CIRCLES THE AXIS OF THE ROD
48: Iron is what type of magnetic material? Is it:
w) diamagnetic
x) paramagnetic
y) ferromagnetic
z) non-magnetic
ANSWER: Y -- FERROMAGNETIC
49: The focal length of a concave mirror is 2 meters. An object is positioned 8 meters in front of the mirror. Where is the image of this object formed?
ANSWER: 8/3 METER or 2.66 METERS IN FRONT OF THE MIRROR Science Bowl PHYSICS
50: A converging thin lens has a focal length of 27 centimeters. An object is placed 9 centimeters from the lens. Where is the image of this object formed?
ANSWER: -13.5 CENTIMETERS or 13.5 CENTIMETERS ON THE OBJECT SIDE
OF THE LENS
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