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Stack #1338724
| Question | Answer |
|---|---|
| Two small objects each with a net charge of Q exert a force of magnitude F on each other. We replace one of these with a charge 4Q. What is the magnitude of the force after the replacement? | 4 F |
| Four arrangements of charge are shown. Each charge has the same magnitude, but some are positive.... All distances are to the same scale.In which arrangement would the magnitude of the force felt by a positive test charge placed at P be the largest? | B and D with a positive and negative charge separated |
| Clothes taken from a clothes dryer sometimes cling together. Consider a load of wool socks and cotton-polyester shirts. | The socks will cling to the shirts, but not to each other. |
| What is the electrostatic potential energy of a -10 μC charge located at x = 5 m and a -5 μC charge located at the origin? | 0.09 J |
| Consider a uniform electric field, for example the field inside a parallel plate capacitor, as shown. If a proton is taken from location B to location C, how does its potential energy change? | it decreases |
| The charges in the groups A and B below are all given in units of Q. Which group of charges took more work to bring together from infinity? | b (triangle) |
| Which requires zero work, to move a positive point charge from point P to point 1, 2, 3, or 4? All those points are the same distance from P. | p-->3 |
| Which requires the most positive work done by an external force, to move a positive point charge from point P to point 1, 2, 3, or 4? All those points are the same distance from P. | p-->1 |
| Location P is equidistant from the two charges of an electric dipole. The voltage at P is | zero |
| Two 10 μC charges are located at (x, y) = (0, 3m) and (3 m, 0), respectively. What is the potential due to those two charges at the location of the 1 μC charge at the origin? | 6*104 V |
| The graph below shows a contour map of the equipotential surfaces due to 3 point charges. point P. | ~800 V/m down |
| A diagram of an irregularly shaped charged conductor is shown below. Rank these locations in increasing order of the strength of the electric field just outside the surface, beginning with the smallest electric field | B < C < D < A |
| A parallel-plate capacitor initially has a voltage of 12 V and stays connected to the battery. what happens? | the charge decreases |
| What must be done to a parallel-plate capacitor in order to increase the amount of charge it can hold for a constant voltage? | either 1) or 2) or both |
| Instead of hitting the green puck, you move it using charges. All charges are negative. Which of the charge distributions below exerts near zero force on the puck? | A (- - - - - puck -) |
| All charges are positive. Which arrow best represents the direction of acceleration of the green puck as it passes just below the wall ? | C |
| What is the force (magnitude and direction) on a -10 μC charge located at x = 5 m from a -5 μC charge at the origin? | 0.018 N into positive x-direction |
| Two 10 μC charges are located at (x, y) = (0, 3m) and (3 m, 0), respectively. What is the magnitude of the force on the 1 μC charge at the origin? | 1.41*10-2 N |
| Two negative point charges with the same charge -q and a point P are located as shown, at the vertices of an equilateral triangle. What is the direction of the electric field due to the two point charges at point P? | The +x direction |
| When a positive charge is released from rest in a uniform electric field, it will | move with constant acceleration. |
| The red charge on the left is a positive 1 microCoulomb charge. What is the magnitude and sign of the blue charge on the right? | -2.6 microCoulomb |
| The figure shows electric field lines representing the field due to three charges. Where does the electric field have the greatest magnitude? | Where the field lines are closest together. |
| Compare the electric flux through surfaces (a) and (b). | none of the above |
| What do you think will happen when a negatively charged balloon is moved towards the neutral wall? | The balloon will be attracted to the wall. |
| Which diagram does not represent an electrical current? | ++++++++> --------> |
| In a storm, falling raindrops carry a current density of +1.0*10-6 A/m2 towards the ground. If 100 drops strike each square meter of ground per second, calculate the magnitude and sign of the average charge on each raindrop in Coulomb. | +1.0*10-8 |
| A steady current moves through a circuit from the positive terminal of a battery to the negative terminal. What happens? | =Both (b) and (c) happen. |
| To what extent is the flow of water analogous to the flow of charge? What is NOT a correct hydrodynamic analog? | charge – volume flow rate |
| Two cylindrical copper wires have the same mass. Wire A is twice as long as wire B. How are their resistances are related? | RA = 4RB |
| If electrical energy costs $0.10 for each kWh, what would it cost to raise a house of mass 5*105 kg (500 metric tons) a height of 1 m above the ground, using an electric motor of 50% efficiency? Use g = 10 m/s2. | ~$ 0.28 |
| If a resistor of resistance R is connected to a battery of voltage V, the equation for the power dissipated in the resistor, P = I2R, implies that a larger resistance R will dissipate more energy and get hotter than a smaller resistance. | FALSE |
| What is the equivalent resistance between the points A and B? | 4.3Ω |
| A real, not ideal, battery is connected as shown. Rank the potential difference across the terminals from the greatest to the smallest. | V4 > V3 > V2 > V1 |
| Rank in order, from brightest to dimmest, the identical bulbs A to D. | A> B > C = D |
| Rank in order, from largest to smallest, the equivalent capacitance (Ceq)a to (Ceq)d of circuits a to d. | (Ceq)b > (Ceq)a = (Ceq)d > (Ceq)c |
| A capacitor of 100 microFarads and a resistor of 1000 Ohms are in series. The circuit has a time constant of 0.1 s. What does this mean? | It takes several times 0.1 second to charge or discharge the capacitor. |
| The region of space around a moving proton contains | both an electric and a magnetic field. |
| Two parallel long wires each have a large current I flowing out of the page, as shown. In what direction does the magnetic field point at position P? | up |
| The magnetic field inside a solenoid (far from the edges) is measured to be 0.10 T. If the solenoid is 1.00 m long and carries a current of 10.0 A, how many turns does it have? | 7958 |
| An electron moves perpendicular to a magnetic field. A magnetic force acts on it in the direction shown. What is the direction of B? | Into the page |
| Two parallel wires are carrying currents in opposite directions as shown. Wire #1 has a current I1 that is out of the page, whereas wire #2 has a current I2 that is into the page. What effect does the magnetic field from wire #1 have on wire #2? | The field exerts a force on wire #2 (directed right). |
| A circular loop of wire carries a constant current. If the loop is placed in a region of uniform magnetic field, the net magnetic force on the loop is | zero. |
| The track ABC in the figure is a reproduction of the path of a charged particle in a cloud chamber. If the magnetic field is perpendicular to this sheet of paper and directed into the paper, the particle | has a negative charge and has moved from C to A. |
| An electron travels in a circular path perpendicular to a uniform magnetic field as shown. A proton also travels with the same speed in a circular path perpendicular to the same magnetic field. Which particle follows the smaller circle? | the electron |
| A circular current loop lies in the xy plane and has radius R = 10 cm. The loop has 20 turns and carries a current I = 4 A. The magnetic dipole moment of the loop is | 2.51 Am2 in negative z- direction. |
| Which statement is false? | There is no torque acting on loop A but a torque is acting on loop B. |
| How should the field lines inside this bar magnet be drawn? | Approximately parallel from the South pole to the North pole. |
Created by:
baverwat