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Salama Bint Butti School Physics Department Name of students in the Group: Final Date is 6th of Nov. 2021 1- ……………………………………………. 2- ………………………………………….. 3- ………………………………………….. 4- ……………………………………………. 5- ………………………………………….. 6- …………………………………………… Physics / Grade 12 General Practical performance exam (1st T – 2021/2022) Coulomb’s Law Experiment: Coulomb’s Law Objective: Determine the factors affecting the electric force between two charges. Materials: https://phet.colorado.edu/en/simulation/coulombs-law Section 1 Procedures: 1) Use the website. https://phet.colorado.edu/en/simulation/coulombs-law 2) Place the first charge at (4 cm) and the second charge at )6 cm( . 3) Record the distance between the two charges (r) in the table below. 4) Adopt the values of the charges as shown in the table below 5) Record the value of the force (F) each time. 1 Section 1 Results: Trial r= …………. 1 First charge Second charge electric force q1 (𝜇𝐶 ) q2 (𝜇𝐶 ) F(N) -2 Draw the force that affects each charge +2 F21 F12 2 -4 +2 3 +4 +6 4 +1 +1 Analyze data: 1. The magnitude of the force between charge (𝑞1 ) and charge (𝑞2) is (directly proportional, inversely ) to the magnitude of the charges . 2. 𝑇ℎ𝑒 𝑓𝑜𝑟𝑐𝑒 𝑡ℎ𝑎𝑡 (𝑞1) 𝑒𝑥𝑒𝑟𝑡𝑠 𝑜𝑛 (𝑞2) ………………𝑇ℎ𝑒 𝑓𝑜𝑟𝑐𝑒 𝑡ℎ𝑎𝑡 (𝑞2)𝑒𝑥𝑒𝑟𝑡𝑠 𝑜𝑛 (𝑞1) but in …………………… direction. 3. Two objects with like charges always …………… each other. 4. Two objects with unlike charges always ………… each other. 2 Section 2 Procedures: 1. 2. 3. 4. Place the first charge(-2µC) at (4 cm) and the second charge(2µC) at )6 cm( . Change distance between charges as shown below Record the distance between the two charges (r) in the table below. Record the value of the force (F) each time. Section 2 Results: Trial 𝑞1 = −2𝜇𝐶 1 distance between chargers Electric force F(N) , 𝑞2 = +2𝜇𝐶 Distance ratio Force ratio 𝑟(𝑐𝑚) 3 affects each charge r1 = 4cm F21 …… 2 Draw the force that F12 – …… 𝒓𝟐 = 𝒓𝟏 𝑭𝟐 = 𝑭𝟏 …… …… 𝒓𝟑 = 𝒓𝟏 𝑭𝟑 = 𝑭𝟏 …… r2 =6cm r3 =2cm Analyze data: 1. The magnitude of the force between charge (𝑞1 ) and charge (𝑞2) is inversely proportional with ……………………………. 2. Two charges are separated by 3 cm 

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