We determine the magnetic field at the focus of a conic section due to a current along the conic section. For a given current , it is shown that this magnetic field is the same and equal to for all conics with the same semilatus rectum .
REFERENCES
1.
J. D.
Kraus
, Electromagnetics
, 4th ed. (McGraw-Hill
, New York
, 1991
), Problems 6-3-10 and 6-3-12.2.
J. A.
Miranda
, “Magnetic field calculation for arbitrarily shaped planar wires
,” Am. J. Phys.
68
(3
), 254
–258
(2000
).3.
M. R.
Spiegel
, Mathematical Handbook of Formulas and Tables
(McGraw-Hill
, New York
, 1968
), pp. 37
–39
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2009
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