it's centered on the " y =10 cm" row, but its Δy is only 6 mm, So I'll call that entire shape an equipotential surfaceĭraw that shape on your white grid-paper and label it "0 V". the low electrode (here, it's an "I" shape) has its potential within 2 mV of the expected "0", all over the painted part. close enough to check the zero electrode! I turned the PS "on", and adjusted its voltage to about 2.5 V. The DMM's red wire is going to probe different places on the paper to find their potentials above that low electrode (Black DVM wire) V displayed = V red − V Black automatically! THAT is the potential which the DVM is going to measure the Red wire's potential relative to. connect the DMM's Black (−, low) banana socket, with a Black wire, to the "Black (low)" electrode's banana socket. The fluorescent lights are prob'ly responsible for the DMM being off by a couple mV You can tell by looking at the display (right-click and "view image" to see the decimal point after the leftmost "00.") it reads to a mV, but allows a maximum 20 Volt reading the sensitivity is now set to be quite coarse. Push the "up" arrow wedge past the "2 V max", to the "20 V max" so a 2½ V potential will not be off-scale We'll be measuring a few Volts, so do not need (or want) that distracting precision With the red probe in the air, the DMM reads random micro-Volts from the fluorescent lights. this DMM defaults to be the most sensitive as it can be and still display its reading Red potential relative to black potential is the negative of black relative to red. a voltage is a difference in electric potential meter = rb = V red − V black Modern DMM's are great because they tell you what units they are measuring! When the Digital MultiMeter ( DMM) is measuring Voltage, it is a Digital Volt Meter ( DVM). You can tell: the PS lights an LED near the Voltage adjust knobs when they are controlling it. Set the Power Supply for Voltage Regulation by turning the Voltage knobs to low, but the current knobs very high. Then pipe them to the PS low (− is Black!) with a black banana-plug wire. We're going to make the (pretend positive) mobile charge go thru the black paper to get to the "I" painted electrode, With Red banana plug from Power Supply high (+ is Red!) to the "T" painted electrode We color-code the expected potentials in our wires, with highest V as Red, then by ROY G BV to Violet, then Black as the lowest. There are enough negative signs in Physics 2 already ! In OUR Lab 2, we will avoid having any negative potentials, by setting our "zero" potential place as the lowest potential on the map. the electric field's average intensity is "10V/distance" in between those lines. you can use the "tape measure" tool to measure the distance from line to line. Places where the equipotential lines are close together have more intense electric field pointing toward the lower potential line. Repeat for the +20V equipotential, +30V, +40V, and −20V, −30V, and −40V equipotentials. motice how symmetric it is (or maybe not quite symmetric). Drag the Voltmeter cross-hairs to find a −10 Volt potential location, and mark it. verify that the places with +10V potential do curve like the line shows. Mark the +10 V equipotential with the pencil. see if you can move the meter yet keep the display at +10V Drag the Voltmeter cross-hairs around until you find a place that has +10 V potential. In doing the actual map by hand, you would need to mark several places along that line before you can connect-the-dots to draw it. verify by dragging the Voltmeter crosshairs around it. Notice that the program just drew the entire 0.0 Volt equipotential line. Drag the Voltmeter crosshairs onto the grid, hover it aound until you find a place that has 0.0 V. Drag & Drop 3 +1 nC charges onto the left side of the grid, along the vertical center-line, (say) at 4, 5, and 7 blocks left from centerĭrag & Drop 3 −1 nC charges onto the right side along the center-line, at symmetric blocks right from the center. uncheck the Electric Field box, check the grid box. The display control box is on top at the right-hand side.
Vmd fieldlines max length manual#
Preparation 1) Read the Lab Manual Theory section and the pictures&captions in the Experiment section Preparation 2) run Phet simulation General Physics II Laboratory Phy.204 Lab 2: Electric Potential Map & Electric field Lines
Phy.204 Lab 2 Data-Page - Curt Foltz website on CoS at MarshallĪbout Marshall Future Students Current Students Alumni Faculty/Staff
0 kommentar(er)
