Question

1. A proton travels through a region of space with no acceleration. Which one of the following statements is the best conclusion? a. Both E and B must be zero in that region. b. E must be zero, but B might be non-zero in that region. c. E and B might both be non-zero, but they must be mutually perpendicular. d. B must be zero, but E might be non-zero in that region. e. E and B might both be non-zero, but they must point in opposite directions.

2. (Give analytical or mathematical explanations to support your answer). An electron enters a region that contains a magnetic field directed into the page as shown. The velocity vector of the electron makes an angle of 30° with the +y axis. What is the direction of the magnetic force on the electron when it enters the field? a. up, out of the page b. at an angle of 30° below the positive x axis c. at an angle of 30° above the positive x axis d. at an angle of 60° below the positive x axis e. at an angle of 60° above the positive x axis

5. (1 point) A proton travels through a region of space with no acceleration. Which one of the following statements is the best conclusion? a. Both E and B must be zero in that region. b. E must be zero, but B might be non-zero in that region. C. E and B might both be non-zero, but they must be mutually perpendicular. d. B must be zero, but E might be non-zero in that region. e. E and B might both be non-zero, but they must point in opposite directions. 6. (2 points) (Give analytical or mathematical explanations to support your answer). An electron enters a region that contains a magnetic field directed into the page as shown. The velocity vector of X X X X X the electron makes an angle of 30° with the +y axis. What X X X X X is the direction of the magnetic force on the electron 130 X X X X X when it enters the field? X X X X X a. up, out of the page b. at an angle of 30° below the positive x axis X X X X X c. at an angle of 30° above the positive x axis d. at an angle of 60° below the positive x axis e. at an angle of 60° above the positive x axis

Answer 1

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