electron traveling horizontally enters a region where a uniform plane of the pap
ID: 1876528 • Letter: E
Question
electron traveling horizontally enters a region where a uniform plane of the paper as shown. Which one of the following phrases most accurately describes the motion magnetic field is directed into the of the electron once it has entered the field? a. downward and parabolic b. upward and parabolic c. upward and circular d. downward and circular e. upward, along a straight line electron Txxx x x n electron is moving with a speed of 3.5 × 105 m/s when it encounters a magnetic field of 0.60 T. The direction of the magnetic field makes an angle of 30.0° with respect to the velocity of the electron. The magnitude of the magnetic force on the electron is (Show work.) 3. A 0.150-m wire oriented horizontally between the poles of an electromagnet carries a direct current of 12.5 A·The angle between the direction of the current and that of the magnetic field is 25.0. If the magnetic field strength is 0.825T, what is the magnitude and direction of the magnetic force on the wire between the poles? (Show work.)Explanation / Answer
1.
It will be upward and circular motion.
This is so because we know that the force on a moving charge q in a magnetic field B is
F=q(v*B)
where v*B is the cross product of v and B.
So, when we do cross product we will get an upward force and a circular motion.
2.
F=qvBsin
F=1.6*10-19*3.5*105*0.6*sin30
=1.68*10-14N
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