Science Bowl Practice Questions

Physics - 8

48.

Multiple Choice: 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

49.

Multiple Choice: A copper rod which is 1 centimeter in diameter carries a current of 5 amps. The
current is distributed 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

50.

Multiple Choice: Iron is what type of magnetic material? Is it:

w) diamagnetic
x) paramagnetic
y) ferromagnetic
z) non-magnetic

ANSWER: Y – FERROMAGNETIC