11) An electron traveling due North with speed 4 x 105 m/s enters a region where
ID: 1770477 • Letter: 1
Question
11) An electron traveling due North with speed 4 x 105 m/s enters a region where the earth's magnetic field has the magnitude 5 x 10-5 T and is directed downward at 45° below 11) horizontal. What magnitude force acts on the electron? 12) What is the magnetic field at the center of a circular loop of wire of radius 4.0 cm when a 12) current of 2.0 A flows in the wire? 13) A 80. volt DC motor draws 4.0 A at its operating speed of 1500. rpm with an 13) armature resistance of 4.0 . (a) What is the starting current? (b) What is the back emf when running normally? (c) What series resistance could be added to limit the starting current to 10. A?Explanation / Answer
11) F = q ( v X B) = q v B sin(theta)
F = 1.6 x 10^-19 x 4 x 10^5 x 5 x 10^-5 sin45
F = 2.26 x 10^-18 N
(12) B = u0 I / 2 R
= (4pi x 10^-7) (2) / (2 x 0.04)
= 3.15 x 10^-5 T
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