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

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The discussion revolves around solving various electrical problems related to physics and electrical engineering concepts. Key questions include calculating the electric field experienced by an airplane in a thundercloud with specific charge concentrations, determining the electrical potential at the midpoint between two point charges, and finding the applied voltage for a lamp with known resistance and power. Additionally, the discussion touches on the temperature coefficient of resistivity for ohmic materials and the energy stored in a capacitor when the separation of its plates is doubled while maintaining the same charge. These problems highlight fundamental principles of electricity and electromagnetism.
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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 seperation, 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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