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Homework answers / question archive / Go to https://phet
Go to https://phet.colorado.edu/en/simulation/charges-and-fields.
Click on the play button to launch the simulation. Once it has loaded, follow these instructions, carefully answering the questions along the way.
• Unselect the “Electric Field” option on the right.
• Select the “Voltage” option on the right. • Drag a “+1 nC” red positive charge from the bottom to the middle.
• Drag the rounded square box with the black crosshairs near the red positive charge. This box is a “V -field detector”. In the white box it shows the value of the V -field (electric potential field) in the middle of the crosshairs.
• Question 1: Drag the detector in a circle around the positive charge keeping the crosshairs a constant distance from it. Describe how the value of the V -field changes as you do this
• Question 2: Drag the detector away further away from the positive charge. Describe the value of the V -field as you do this. Describe what the red color in the simulation is indicating.
• Drag the positive charge back to the box at the bottom. Drag a “-1 nC” blue negative charge to the middle.
• Questions 3 and 4: Repeat Questions 1 and 2 but with the negative charge present instead.
• Drag a positive charge to a location a moderate distance from the negative charge.
• Question 5: Use the detector to investigate the V -field produced by the two charges together. Describe your findings.
• Question 6: Investigate the region exactly halfway between the two charges. What is the value of the V -field in this region? Come up with a reason why this value makes sense.
• Question 7: Using any configuration of charges (your choice), investigate what the “pencil” button on the lower right part of the V detector with the crosshairs does. Describe your findings.
Ans-1
Value of the V-field remains constant in a fix distance around the positive charge.
Ans-2
As we go away from the positive charge, value of the V-field decreases.Red color indicating how the electric potential is distributed around the positive charge.
Ans-3
Value of the V-field remains constant in a fix distance around the positive charge.But this time value indicating by the detector is negative.
Ans-4
As we go away from the negative charge, value of the V-field decreases in magnitude (ignoring sign). Blue color indicating how the electric potential is distributed around the negative charge.
Ans-5
Detector shows value positive or negative according to the nearest charge.
Ans-6
As we go through above and below the mid point (halfway) taking detector we find detector shows zero value at all points. i.e. at every point which is equidistant from these two charges detector shows zero value.
This value make sense because at these points value due to positve charge is equal to the negative charge but oppsite in sign.i.e one is positive and other is negative.
Ans-7
It draws a distorted circle going through the middle of the crosshairs around the nearest charge to the detector and at every point on a particular distorted circle the value of the V-field remains same around that charge.Means it draws equipotential curves.And these curves do not intersect each other.
