Force on a Moving Charge: Three particles travel through a region of space where the magnetic field is out of the page, as shown in the figure. What are the signs of the charges of these three particles?

A. 1 is neutral, 2 is negative, and 3 is positive.
B. 1 is neutral, 2 is positive, and 3 is negative.
C. 1 is positive, 2 is neutral, and 3 is negative.
D. 1 is positive, 2 is negative, and 3 is neutral.
E. 1 is negative, 2 is neutral, and 3 is positive.


Answer: E

Physics & Space Science

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Fill in the blank(s) with the appropriate word(s).

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Circular Motion of Charges: A proton, starting from rest, accelerates through a potential difference of 1.0 kV and then moves into a magnetic field of 0.040 T at a right angle to the field. What is the radius of the proton's resulting orbit? (e = 1.60 × 10-19 C, mproton = 1.67 × 10-27 kg)

A. 0.080 m B. 0.11 m C. 0.14 m D. 0.17 m

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A hydrogen atom is in the 6h state. Which of the following could be an orbital quantum number?

A) 5 B) 6 C) 7 D) 8 E) 9

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The original substances in a chemical reaction are called the ______________

Fill in the blank(s) with correct word

Physics & Space Science