1. A wire has a length of 3.59 m and carries a current of 4.96 A from right to l
ID: 1513938 • Letter: 1
Question
1. A wire has a length of 3.59 m and carries a current of 4.96 A from right to left across the floor. A magnetic field of 0.094T is directed from the floor to the ceiling.
a. What is the magnitude of the force on the wire?
b. What is the direction of the force? Explain your answer.
2.
An electron is acclerated from rest by a potential difference of 350 V. It then enters a uniform magnetic field of magnitude 200 mT directed straight down and perpendicular to the velocity of the electron. Calculate.
a. The velocity of the electron
b. The radius of its path
c. The period of its motion.
d. Does the electron travel in a clockewise/counterclockwise path as seen from above? Explain your reasoning.
3. An electron is moving in a counterclockwise circle of radius 15.4 cm in the plane of the floor at a speed of 1.56 X 10^6 m/s. A magnetic field is directed perpendicular to the floor.
a. What is the magnitude of the magnitidue field?
b. How many revolutions per second does the electrons make?
c. Is the magnetic field into floor or out of the floor? Explain.
Explanation / Answer
Question 1:
a)
F = ilB sin (theta)
F = 4.96A*3.59m*0.094T*sin 90o
F = 1.6738 N
b)
According to the Fleming's Left Hand Rule the direction of the force is OUT of the Paper.
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