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Physics MCQ series - 05

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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?


w) A divided by d squared
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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