1) There are 3 charges situated on the x-axis: a +7.0 nC charge at (-3 cm, 0), a
ID: 2231309 • Letter: 1
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1) There are 3 charges situated on the x-axis: a +7.0 nC charge at (-3 cm, 0), a +5.0 nC charge at the origin (0, 0) and a -9.0 nC charge at (3 cm, 0). What is the electric potential at the point (0, 3 cm) on the y-axis? 2) A cylinder type parallel plate capacitor is made of two 2.0 cm x 20.0 cm plates that are separated by 1.5 x10-6 m of Teflon with a dielectric constant of 2.1. If the capacitor is hooked up to a 12 V battery, how much energy can it store? The fact that it is a cylinder has no bearing on the problem. 3) A 12.0 micro Farad capacitor is fully charged by a 9.0 V battery before it is disconnected from the battery and connected to a 50000 ohm resistor. What is the charge on the capacitor after 0.30 seconds as it discharges through the resistor?Explanation / Answer
follow this exalple put data in it and get answer q1, q2, q3 –from the lower left corner – counterclockwise. Origin of the coordinate system is at the corner where q1 is located. F12=k•q1•q2/a² = =9•10^9•8.7•10^-9•7.2•10^-9/9.2²•10^-4= = 6.74•10^-5 N F12x=0 F12y=6.74•10^-5 N. F13=k•q1•q3/D(av2)² = =9•10^9•8.7•10^-9•4.8•10^-9/9.2²•10^-4•1.41= =3.15•10^-5 N F13x=F13y=3.15•10^-5•cos45=2.23•10^-5 N. F1x= F12x+ F13x =0+2.23•10^-5 =2.23•10^-5 N. F1y= F12y+ F13y= 6.74•10^-5 +2.23•10^-5 =8.97•10^-5 N. F1=sqrt(F1x² + F1y²) =sqrt(2.23² +8.97²)•10^-5 =9.24•10^-5 N The same procedure for other charges
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