A charged particle (m = 5.0 g, q = ?70 ?C) moves horizontally at a constant speed of 30 km/s in a region where the free fall gravitational acceleration is 9.8 m/s2 downward, the electric field is 700 N/C upward, and the magnetic field is perpendicular to the velocity of the particle. What is the magnitude of the magnetic field in this region?
A. 47 mT
B. zero
C. 23 mT
D. 35 mT
E. 12 mT
Answer: A
You might also like to view...
The distribution of the dark matter in a spiral galaxy is
A) flattened in a disk but about ten times larger than the stellar disk. B) flattened in a disk and about the same size as the stellar disk. C) approximately spherical and about ten times the size of the galaxy halo. D) predominantly concentrated in the spiral arms. E) approximately spherical and about the same size as the galaxy halo.
When a battery is used to light up a lightbulb,
A) the amount of electrical current flowing into one side of the battery is equal to the amount flowing out of the other side. B) electric charge builds up on the battery terminals but none of it actually flows through the bulb. C) electric charge builds up within the bulb, causing the bulb to light up. D) some of the electrical current produced by the battery is consumed by the bulb, and the rest flows back into the battery. E) all the electrical current produced by the battery is consumed by the bulb.
A 500-kg elevator is pulled upward with a constant force of 5500 N for a distance of 50.0 m. (a) What is the work done by the 5500-N force? (b) What is the work done by gravity? (c) What is the net work done on the elevator?
What will be an ideal response?
Notice the numbered points on this photo of the Gemini North reflecting telescope. Where is the secondary mirror located?
A) Point 1 B) Point 2 C) Point 3 D) Point 4