Solve Electrical Problems: Airplane in Thundercloud, Point Charges & More!

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SUMMARY

This discussion focuses on solving electrical problems related to point charges and capacitors. The first problem involves calculating the electric field at an airplane flying through a thundercloud with charge concentrations of +40 C and -40 C at different heights. The second problem requires finding the electrical potential midway between two point charges of +3.4 C and +6.6 C. The third problem addresses the applied voltage for a lamp with a resistance of 120 Ohms operating at 100W. Lastly, the discussion explores the temperature coefficient of resistivity for ohmic materials and the energy ratio in a capacitor when the plate separation is doubled.

PREREQUISITES
  • Understanding of Coulomb's Law for electric fields and potentials
  • Knowledge of Ohm's Law for voltage, current, and resistance
  • Familiarity with the concept of capacitors and energy storage
  • Basic principles of resistivity and temperature coefficients
NEXT STEPS
  • Calculate electric fields using Coulomb's Law
  • Explore the concept of electrical potential and its calculations
  • Review Ohm's Law and its applications in electrical circuits
  • Investigate the relationship between capacitance, energy, and plate separation
USEFUL FOR

Students studying electrical engineering, physics enthusiasts, and anyone tackling problems related to electrostatics and circuit theory.

thspoq2
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Im doing some homework problems and I cannot figure out how to do these for the life of me. Any help would be appreciated.

1. An airplane is flying through a thundercould at a height of 2000 m. If there is a charge concentration of +40 C at 3000 , within the cloud and -40 C at height 1000 m, what is the electric field at the aircraft?

2. Two point charges of values +3.4 and +6.6 C are separated by .10 m. What is the electrical potential at the point midway between the two point charges?

3. If a lamp has resistance of 120 Ohms when it operates at 100W, what is the applied voltage?

4. The temperature coefficient of resistivity for a "perfect" ohmic material would be?
 
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Sorry, make it 5.

5. A pair of parallel plates, forming a capacitor, are charged. The plates are pulled apart to double the original separation, the charges on the plates remaining the same. What is the ratio of the final energy stored to the original energy stored?
 

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