(A) The charge of the particle is increased by a factor oftwo, and the particle
ID: 1671165 • Letter: #
Question
(A) The charge of the particle is increased by a factor oftwo, and the particle is found to movein a circle of radius R'. What is the ratioR'/R?(B) The mass of the particle is decreased by a factor ofthree, and the particle is found tomove in a circle of radius R'. What is the ratioR'/R?
2)A long, straight wire of length 1.2 m carries a current of I =4.7 A. If a magnetic field ofmagnitude B = 2.5 T isdirected perpendicular to the wire, what is the magnitude of theforce on the wire?
N
1)A charged particle moves in the x-yplane, and a magnetic field B is directed into the planeas shown in the figure below. The magnetic force on the particlecauses the particle to move clockwise along a circle of radiusR. (A) The charge of the particle is increased by a factor oftwo, and the particle is found to movein a circle of radius R^'. What is the ratioR^'/R? (B) The mass of the particle is decreased by a factor ofthree, and the particle is found tomove in a circle of radius R^'. What is the ratioR^'/R? 2)A long, straight wire of length 1.2 m carries a current of I =4.7 A. If a magnetic field ofmagnitude B = 2.5 T isdirected perpendicular to the wire, what is the magnitude of theforce on the wire? N
Explanation / Answer
We have centripetal force equal to magnetic force. mv^2/r=Bqv so r=mv/Bq. A). speed is doubled so R'/R=2 b) . m is decreased by a factor of three. so R'/R=1/3. ------------------ 2)F=B*I*L=14,1(N)
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