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11.
Magnetic Force on Moving Charge The magnetic force is always perpendicular to v ; a particle moving under the action of a magnetic field alone moves with a constant speed.
12.
Motion of charged particles in a magnetic field
13.
Motion of charged particles in a magnetic field Fig. 27.18
14.
Motion of charged particles in a magnetic field Fig. 27.17
Used to determine the magnetic field yielded by current-carrying wire
Ampere’s law states that the product B and length of line segment around any closed path equals µ 0 times the net current through the area enclosed by the path.
Direction of Magnetic field is determined by corkscrew method
A horizontal wire carries a current I 1 =80 A dc. A second parallel wire 20 cm below it must carry how much current I 2 so that it doesn’t fall due to gravity? The lower wire is a homogenous wire with a mass of 0.12 g per meter of length.
F/L = mg/L =1.18 x 10 -3 N/m 0 I 1 I 2 /2 L = 1.18 x 10 -3 N/m I 2 = 15 A
Ampere current flowing in each of the two long parallel conductors 1 m apart, which results in a force of exactly 2 x 10 -7 N/m of length of each conductor.
Coulomb one ampere-second
28.
Solution Set F/l= 0 I 1 I 2 /2 L F A /l= 5.83 x 10 -5 N/m; 90 F B /l=3.37 x 10 -5 N/m; -60 F C /l=3.37 x 10 -5 N/m; 240
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