Calculate the electric field along the axis at a distance x from the center of a charged disk with radius R.
Tag: physics
Calculate the electric field along the axis at a distance x from the center of a charged ring with radius R.
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HR 23.5 Charge is Quantized
Charge is quantized. The elementary charge has the value:
e = 1.60×10-19C
SP2. A penny, being electrically neutral, contains equal amounts of positive and negative charge. What is the magnitude of these equal charges?
Mpenny = 3.1g
Atomic mass of copper = 63.546 amu
Atomic number of copper = 29
1 amu = 1.66×10-24g
- Find number of Cu atoms in 3.1g
- 3.1g / (63.546 amu * 1.66×10-24g) = 2.94×1022
- Find number of protons (or electrons)
- 2.94×1022 x 29 = 8.522×1023
- Find charge of protons (or electrons)
- 522×1023 * 1.60×10-19C =136,358.9C
Answer is ~136,000C
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HR 23.4 Coulomb’s Law
Coulomb’s law describes the electrostatic force acting between the charges of two particles.
- F = Force (Newtons)
- q1 = Charge of first particle (Coulombs)
- q2 = Charge of second particle (Coulombs)
- r2 = Distance between particles (Meters)