Section 2 You observe an electron moving on your test paper in a clockwise circl

Question

Section 2 You observe an electron moving on your test paper in a clockwise circle of radius H. 5.1 cm, at a constant speed of L 1-7 - x 106 m/s. (a) Suppose that the electron's circular motion is due to the presence of a uniform magnetic field. What must be the magnitude and direction of this magnetic field? Answer:Lx 10T (for the magnitude) Answer for direction: choose from the following six possibilities and circdle the correct one.... Toward the top of the page To the left Toward you Toward the bottom of the page To the Right Away from you /N stationary charged particle located at the center of the circle. What is the value of this stationary charge? Make sure to specify the correct sign on the charge in your answer. Answer: 10_c (b) Suppose instead that the electron's circular motion is due to the presence of a

Explanation / Answer

b)

electrostatic force is balanced by centripetal force

KQQe/R2 =mV2/R

Q=mV2R/KQe =(9.11*10-31)(1.7*106)2(0.051)/(9*109)(1.6*10-19)

Q=9.324*10-11C

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