Question 1: The electric potential of a region of space is given by V(x,y,z) = 2x + 3y + 1/z. Which of the following statements must be true? The y component of the electric field in this area is constant The z component of the electric field in this area is constant The x component of the force experienced by an electron in this field is negative The y component of the force experienced by an electron in this field is negative An electron in this field will start moving parallel to the equipotential lines Question 2: Two resistors and a capacitor are connected to a 20V source as shown below. What is the charge on each conducting plate of the capacitor? .24mC 1mC .2mC .12mC 1.2mC Question 3: Four point charges are located in free space on a circle C of radius r, as shown below. What is the magnitude of the electric field at the origin due to the four charges, if the area of the circle is A = π, and k is Coulomb's constant? kQ 2kQ 3kQ 4kQ 5kQ Question 4: Two charged particles enter a region with the same speed, v, as seen in the figure below. After entering the region, both particles move in the same direction. If the positive charge accelerates and the negative charge decelerates, the region could have: an electric field oriented in direction -x and no magnetic field an electric field oriented in direction x and no magnetic field a magnetic field oriented in direction x and no electric field a magnetic field oriented in direction -x and no electric field an electric field oriented in direction y and no magnetic field Question 5: A sphere of uniform charge density and radius R is charged with a positive charge +Q. The electric field at a R/2 distance from the sphere center is E. What is the electric field at a distance of 2R from the center? E/4 E/3 E/2 2E/3 E Question 6: Capacitor C1 is created with two parallel square conducting plates of area A, dielectric of relative permitivity ε and distance between the plates d1 = 3mm. Capacitor C2 is created with two parallel square conducting plates of the same area A, dielectric of relative permitivity ε and distance between the plates d2 = 1mm. If Cs is the capacitor equivalent to C1 in series with C2 and Cp is the capacitor equivalent to C1 in parallel with C2, then Cs/Cp is equal to: 3/16 3/4 4/3 1/4 3/8 Question 7: A voltage source E is connected to four resistors as shown in the figure below. What is the value of the current that flows through the the voltage source E? .2E/R .4E/R .5E/R .6E/R .8E/R Question 8: A positive charge travels through a region with a magnetic field B, with a speed v, as shown above. If the force on the particle due to the magnetic field is F, which of the following orientations of the force must be true? a b c d e Question 9: A wire bent at a 90o angle carries a current i, as shown below. The magnetic field at point A: is a function of the current i, but not a function of the distance a is parallel to the diagonal d must be equal to 0 is oriented into the page, pointing down is oriented out of the page, pointing up Question 10: A voltage source E is applied to a circuit formed by a resistor R and an inductor L connected in series. What is the current in the resistor at the time t = L/R after the switch S1 is closed? (E/L)/R (E/R)/L (E/R)/(1-e) (E/R)/(1-1/e) E/R Press the Submit button to see the results.