Whenever you touch the negatively charged rod with the electroscope then due to induction the charges are getting transferred from the rod to the electroscope, when you touch it with your finger which is neutral , charges are transferred back to the hand
This is a basic simulation showing the force of attraction or repulsion between two charged objects. The charge on each object and the positions of the objects can be changed. The resulting forces are shown by force vectors, and the numerical magnitude is also shown.
This simulation shows you the magnitude and the direction of the force that acts on each of two charged objects due to the other object. Use the sliders or input boxes to change the amount of charge on each of the two objects. Move the charges around and watch how the force vectors change magnitude and direction. The amount of force that acts is shown. Graphs of the force magnitude vs. the distance between the two objects (r) and force magnitude vs. the magnitude of the charge on q1 can be viewed
This simulation is a simplified version of an experiment done by Robert Milliken in the early 1900s. Hoping to learn more about charge, Milliken sprayed slightly ionized oil droplets into an electric field and made observations of the droplets. When the voltage is zero and the run button is pressed, the drop will fall due to the force of gravity. It will reach a terminal velocity (vt) as it falls. Pause the simulation while you record the terminal velocity. This terminal velocity can be used to determine the mass of the drop. Use the equation: mass = kvt2 to determine the mass of the particle. The value of k in this simulation is 4.086 x 10-17 kg s2/m2. Once the terminal velocity is recorded and the mass calculated, with the simulation still paused increase the voltage between the plates until the two force vectors are approximately equal length. This will produce an upward field and an upward force on the positive droplets. If the upward force of the electric field is equal to the downward force of gravity, and the drag force is zero, the particle will not accelerate. To be sure that the lack of acceleration is not related to drag forces, the velocity must also be zero as well as the acceleration in order to be sure that the two forces are balanced. Increase and decrease the voltage (use the left/right arrow keys) until both the acceleration and velocity are at zero. The velocity may not stay at exactly zero, but find the voltage that has the velocity changing most slowly as it passes v = 0.
Use the methods discussed above to ultimately determine the charge on ten (or more) different oil-drops. Use V = Ed to calculate the field strength (d = 5 cm = 0.05 m). Use qE = mg when the velocity is zero to determine the charge q on the droplet. Record all your data in a table or spreadsheet. After you get each q, create a new particle and start again. When you have the table filled in, look at the various values for q. Is there any pattern to them, or are they seemingly random?
In this simulation you can adjust the charge and position of the two charges using the sliders or the input boxes. The sliders work, but do not work smoothly due to the complexity of the calculations - so you may be better off using the input boxes. Choose to view in 3D and the Electric Potential is shown as the third dimension. Choose the equipotential view and you'll see a 2D view with equipotential lines. In this view you can also choose to see vectors showing the direction of the electric field. In the equipotential view, there is also a movable point that shows the magnitude and direction of the electric field as well as the electric potential at that point.
Simulation of a capacitor charging. Use the sliders to adjust the battery voltage, the resistor's resistance, the plate area, and the plate separation. Use the check boxes to open and close the switch, as well as turn the animation on one off. When animation is turned off, you can use the step buttons to advance time forward or backward in small steps