V1 D) A positively charged particle moves with constant velocity through a regio
ID: 1731394 • Letter: V
Question
V1 D) A positively charged particle moves with constant velocity through a region of uniform electric and magnetic fields. The electric fied in the region is in the negative z-direction and the magnetic field in the region is in the positive y-direction. Ignore the weight of the particle. What is the direction of the velocity of the partiele in this region? A) Positive x B) Negative x C) Positive y D) Negative y E) Positive z 2) A resistor and an uncharged capacitor are connected in series with an ideal battery that has a constant voltage across its terminals. At the moment this circuit is closed, the voltage across the resistor is A) less than the voltage of the battery, but greater than zero B) equal to the voltage of the battery. C) equal to the voltage across the capacitor. D) zero. E) equal to the sum of the voltages across the battery and the capacitor 3) The figure shows a negatively charged particle moving directly above a wire carrying current as shown. In which direction is the force experienced by this particle if no other fields are present? A) out of the page B) into the page C) upward D) downward B) The magnetic force is zero since the velocity is parallel to the current. 4) A negatively charged particle enters a magnetic field with velocity in the positive y- direction. The magnetic force on the particle is in the positive x-direction. What can you conclude about the x and z-components of the magnetic field at the particle's position? E) B,Explanation / Answer
1) A positive x
electric field is along negative z and hence electric force is along negative z. to balance this force magnetic force should be along positive z
2) B equal to the voltage of the battery
( at the moment the conection is made, potential difference across capacitor is zero , hence the total voltage appears across resistor)
3) A out of the page
4) B
as the velocity is along positve y and force is along positive x, B should be along positive Z
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