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PHY 202 Exam 2
| Question | Answer |
|---|---|
| The potential energy of a positive charge increases with distance from a negatively charged plate. How does the potential energy of a positive charge change with distance from a positively charged plate? | Decreases |
| How does the potential energy of a negative charge change with distance from a negatively charged plate? | Decreases |
| A dipole is placed in the uniform electric field between a pair of oppositely charged parallel plates. When is the potential energy of the dipole smallest? | When the dipole moment aligns with the plate’s electric field. |
| There is zero electric field in the space between a pair of parallel plates. The two plates | Have the same voltage |
| As you move along an electric field line in the direction of the electric field vector, the value of the electrostatic potential | Decreases |
| A charged particle is released from rest in a region where there exists an electric field. After being released the particle accelerates in the direction of increasing voltage. What is the charge of the particle? | Negative |
| A hollow conducting cylinder (black) is placed between a pair charged parallel plates (red & blue). Inside the hollow conductor, the electric potential | Remains constant |
| Two neutral insulators are brought into contact and then separated. As a result one of them gains a net positive charge. Which statement below is false? | Charge was created (so the system gained charge |
| A parallel plate capacitor is connected to a PSU (maintains a constant voltage 𝑉 across the capacitor plates). If the distance between the plates is doubled, the charge separated by the plates will | Half [using q=eoA/d] |
| A parallel plate capacitor has charge ±𝑞 on its plates. The plate are isolated (not connected to any PSU). If the distance between the plates is doubled, the voltage difference between the plates will | Double, q is proportional to 1/d because q is fixed and V is proportional to d or V/d is a constant |
| A pair of parallel plates carries charges ±𝑞. (No PSU). A neutral metal slab is inserted in the space between the plates, partially filling it. What happens to the potential difference between the plates? (Hint: what’s 𝐸 inside the slab?) | Decreases, in the slab there is no E |
| If the terminals of the Zn-Cu cell were connected to an external circuit so that electrons flow from the Zn to the Cu electrode, what completes the flow of charge inside the battery? | Positive ions moving from Zn to Cu, Zn electrode will diminish as Cu electrode grows |
| A certain capacitor separates 1 μC of charge at 1 V (between plates). How much charge does it separate at 10 V? | 10 μC, using q=CV |
| An air-filled //-plate capacitor is attached to a PSU that maintains a constant V between the plates. While the PSU is connected, a quartz slab is inserted between the plates, filling the space completely. The energy stored in the capacitor | Increases, using u=1/2 CV^2 |
| An isolated air-filled parallel-plate capacitor carries charge ±𝑄. A quartz slab is inserted between the plates, filling the space completely. As a result, the amount of stored energy in the capacitor | decreases |
| ∆U = q∆V or ∆V=-E∆r | voltage measuring the energy per charge, ∆U is also work |
| ∆V = −integralE *dl is the same as | ∆V=-E∆r |
| where equipotentials are ---- together is where the field is the strongest | closest |
| V =kq/r | for when charge is uniformly distributed inside a shell, treat the Voltage of the shell like a point charge |
| ∆V = 2kλ ln(r1/r2) | r2 is a reference point closs |
| Ex = −∂V/∂x | this is for when E = gradient of V, so Ex would be added with Ey and Ez |
| Q = CV | charge for a capacitor |
| C =eoA/d | capacitance for // plates |
| C =2πeol/ln(R2/R1) | capacitance for concentric cylinder conductors |
| K is the dielectric constant, when given it | just multiply it when trying to find capacitance |
| C =4πeoR1R2/R2 − R1 | concentric spherical shells |
| U =1/2CV 2 | total energy stored by a capacitor |
| u =1/2eoE^2 | energy density |
| How do a north magnetic pole and a south magnetic pole interact? | They attract each other |
| The Earth itself behaves like a large magnet. Which type of magnetic pole is located near the north geographic pole? | A south magnetic pole |
| A dipole bar magnet (N pole at one end and S pole at the other and) is cut in half. The result is | Two dipoles (each half has a N and a S) |
| Near which point is the magnetic field outside the magnet strongest? [27.2a] | A |
| Consider a Gauss surface enclosing a single magnetic dipole. Which of the following is true of the magnetic field line flux of the dipole through the Gauss surface? | it is zero |
| In which direction do the magnetic field lines run inside the bar magnet? [Hint: Gauss’s law.] | From S to N |
| In an ionic solution a 1mA current is formed by Na+ ions moving to the right. If Cl− ions also move to the right at the same rate, the total current is | 0, because opposite charges therefore net change of 0 |
| In an ionic solution a 1mA current is formed by Na+ ions moving to the right. If Cl− ions also move to the left at the same rate, the total current is | 2mA |
| Current right hand rule | thumb-current, pointer-r, curled fingers-B |
| A wire is carrying a current directly toward you (along your line of sight). What is the direction of the magnetic field made by this current from your point of view? | Counterclockwise around the wire |
| Does the bar magnet experience a net force from the wire? (The blue field is made by the wire.) [27.3d] | Yes, rightward |
| Force right hand rule | thumb-current, pointer - force, middle finger - B |
| Two parallel wires carry current in the same direction. The magnetic force causes the wires to [ 27.3e] | attract |
| I = qnvA | current through a wire, n=number of charges per volume |
| when I and B are //, F= ? | 0 |
| when I and B are perpendicular the F is at its --- | greatest |
| A positive charge is initially moving in a magnetic field as shown. What is the direction of the magnetic force the charge experiences? | Inward |
| A positive charge is initially moving in a magnetic field as shown. What is the direction of the magnetic force the charge experiences? | 0 |
| An electron with velocity 𝑣 enters a region of uniform magnetic field, causing it to deflect into a circle of radius 𝑟. If a proton entered the same magnetic field with the same initial velocity it would move | in a larger circle in the opposite direction |
| charges in a conductor --- | cancel |
Created by:
Josalin
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