2LB_Lab_8_MagForceOnCurr7 - Magnetic Force on a Current...

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Magnetic Force on a Current (**Includes Pre Lab Assignment) A wire carrying a current in a magnetic field experiences a force r r r Fi L B = × or L B = sin θ where is the force, i is the current, is the wire length, r F r L r B is the magnetic field, and is the angle between the field and the wire. The force will be directly measured in the lab. The values of i , L , and B will be varied, so that the dependence of F on them can be studied. Apparatus The magnetic force between the wire and field will be directly measured from the changing weight of the magnets used. The magnet assembly is placed atop a sensitive electronic balance, and the current carrying wire is suspended between the magnet poles (see below). The apparatus includes Magnet assembly with six removable magnets Electronic balance (0.01 gram sensitivity) Support stand and arm for the current carrying wire Various lengths of current carrying wire Direct current power supply (0 - 5 Amperes) Ammeter A ruler to measure the length of the current loop In addition, a computer with Data Studio software will be used for data analysis and presentation.
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The Physics The force on a moving charge in a magnetic field is r F q = q r v × r B . This force was our first introduction to the magnetic field, and forms, in some sense, the definition of a magnetic field. If a current carrying wire is placed in a magnetic field, a force will be exerted on the wire. The total current consists of individual charge carriers, so that for a length r L of wire we get i = nqvA where n is the number density of carriers, and A is the cross sectional area of the wire.
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This note was uploaded on 01/11/2010 for the course PHYS 2b taught by Professor Clare during the Fall '07 term at UC Riverside.

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2LB_Lab_8_MagForceOnCurr7 - Magnetic Force on a Current...

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