magnetic moment - 2024 ACF Fall

Question

Crossing this quantity with the B-field gives torque. For 10 points each:

[10h] Name this quantity that describes the strength and orientation of a magnetic field. This quantity equals current times enclosed area for a loop of current.

ANSWER: magnetic moment [or magnetic dipole moment; prompt on dipole moment; reject “electric dipole moment”; reject “magnetic flux”]

[10e] The intrinsic magnetic moment of an electron is approximately one times this physicist’s namesake magneton. Electrons orbit a positive nucleus in this Danish physicist’s model of the atom.

ANSWER: Niels Bohr [or Niels Henrik David Bohr; accept Bohr magneton or Bohr model]

[10m] A type of this phenomenon named after Joseph Larmor is caused by a magnetic moment in an external magnetic field. The gyroscopic form of this phenomenon is torque induced.

ANSWER: precession [accept Larmor precession; gyroscopic precession or torque-induced precession]

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Summary


2024 ACF Fall at Cornell	fall	Y	9	14.44	100%	33%	11%
2024 ACF Fall at Ohio State	fall	Y	8	11.25	100%	13%	0%
2024 ACF Fall at Washington	fall	Y	6	11.67	100%	17%	0%
2024 ACF Fall at Georgia	fall	Y	12	14.17	92%	25%	25%
2024 ACF Fall at North Carolina	fall	Y	9	10.00	89%	11%	0%
2024 ACF Fall at Claremont Colleges	fall	Y	5	20.00	100%	60%	40%
2024 ACF Fall at Rutgers	fall	Y	8	15.00	100%	50%	0%
2024 ACF Fall at Illinois	fall	Y	9	16.67	100%	44%	22%

Data


ESF	Binghamton A	0	10	0	10
Syracuse	Binghamton B	0	10	0	10
RIT C	Cornell A	0	10	0	10
Cornell C	Cornell F	10	10	10	30
Cornell E	Cornell B	0	10	0	10
Cornell D	Cornell G	0	10	10	20
RIT B	Penn State	0	10	0	10
U of Rochester A	RIT A	0	10	0	10
Binghamton C	U of Rochester B	0	10	10	20
CWRU B (DII)	Michigan B (UG)	0	10	0	10
Miami A (UG)	CWRU C (UG)	0	10	0	10
Miami B (UG)	Michigan C	0	10	10	20
Jefferson County Scholars (DII)	Miami C (DII)	0	10	0	10
West Virginia A (UG)	Michigan State B	0	10	0	10
Michigan D (UG)	Ohio State A (UG)	0	10	0	10
Michigan State A	Ohio State B (DII)	0	10	0	10
West Virginia B (UG)	Ohio State C (DII)	0	10	0	10
Alberta	Boise State	0	10	0	10
Arizona State A	UW Pride	0	10	10	20
UBC A	Arizona State B	0	10	0	10
UW Lust	UW Chastity	0	10	0	10
UW Wrath	UW Envy	0	10	0	10
UW Sloth	UW Greed	0	10	0	10
Alabama A	Auburn B	0	10	0	10
Georgia A	Auburn C	0	10	0	10
Emory Oxford	Belmont	0	10	0	10
Mississippi State A	Furman	0	10	0	10
Mississippi State A	Furman	0	10	0	10
Mississippi State A	Furman	0	10	0	10
Mississippi State A	Furman	0	10	0	10
Mississippi State A	Furman	0	10	0	10
Mississippi State A	Furman	0	10	0	10
Mississippi State A	Furman	0	10	0	10
Mississippi State A	Furman	0	10	0	10
Georgia Tech A	Clemson A	10	10	0	20
Georgia Tech E	Georgia Tech B	10	10	10	30
Georgia Tech C	Emory Oxford	10	10	0	20
Georgia Tech D	South Carolina B	0	10	10	20
South Carolina A	Clemson B	0	10	10	20
Auburn A	Tennessee B	0	10	0	10
Vanderbilt B	Vanderbilt A	0	0	0	0
Appalachian State B	Tusculum	0	10	0	10
Duke A	William & Mary	0	10	0	10
James Madison A	James Madison B	0	0	0	0
Virginia Tech A	Liberty C	0	10	0	10
NC State	Appalachian State A	0	10	0	10
UNC A	Liberty B	0	10	0	10
Duke B	UNC C	0	10	0	10
Virginia	VCU	0	10	0	10
UNC D	Virginia Tech B	0	10	10	20
UCLA C	Claremont A	10	10	10	30
UCLA A	UCLA D	0	10	0	10
UCLA B	Claremont C	0	10	0	10
UCSD	Claremont B	10	10	10	30
UCLA E	USC	0	10	10	20
Bard A (UG)	Maryland B (DII)	0	10	0	10
Columbia A (UG)	Penn B (DII)	0	10	10	20
Columbia B	Lehigh A (UG)	0	10	10	20
Fordham A	Princeton A (UG)	0	10	0	10
Maryland A (DII)	Penn A (DII)	0	10	10	20
Columbia J (DII)	NYU A (UG)	0	10	10	20
Rutgers A (UG)	Rowan A (DII)	0	10	0	10
NYU B	Rutgers B	0	10	0	10
Illinois A	Chicago B	10	10	10	30
Illinois C	Purdue C	0	10	0	10
Notre Dame C	Indiana	10	10	0	20
Iowa A	Illinois D	0	10	0	10
Northwestern A	Iowa B	0	10	10	20
Northwestern B	WashU A	0	10	0	10
Notre Dame A	WashU B	0	10	10	20
Notre Dame B	SIUE	0	10	0	10
Purdue B	Illinois B	0	10	10	20