Although electrons do not normally have precise positions, you can cause an electron to have a (fairly) precise position by
A) measuring its velocity.
B) measuring both its position and velocity at an earlier time.
C) measuring its position.
D) measuring its momentum at an earlier time.
E) measuring its wavelength.
Question 2
Two point charges of +20.0 C and -8.00 C are separated by a distance of 20.0 cm. What is the magnitude of electric field due to these charges at a point midway between them? (k = 1/40 = 8.99 109 N m2/C2)
A) 25.2 106 N/C directed toward the negative charge
B) 25.2 106 N/C directed toward the positive charge
C) 25.2 105 N/C directed toward the negative charge
D) 25.2 105 N/C directed toward the positive charge
E) 25.2 104 N/C directed toward the negative charge
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