Name Due Date: Monday, February 19,2018 NOTE: NO LATE WORK WILL BE ACCEPTED AFTE

Question

Name Due Date: Monday, February 19,2018 NOTE: NO LATE WORK WILL BE ACCEPTED AFTER the start of class on MONDAY, February 19 NAT 114 Homework #4 Electricity & Magnetism, Waves 1. The source of ALL magnetism is 2. What must happen with magnets in order to cause electricity to flow? Explairn Explain the energy transfer steps that occur in a hydroelectric power plant. Begin with the water at the top of the dam and its energy type. Conclude with the electrical power at the end. 3. 4. Why aren't birds electrocuted while perched on a 2000-volt power line? Waves& Sound and Light 5. Give an example of a wave that is a a. Transverse wave b. Longitudinal wave

Explanation / Answer

1. source of all magnetism is moving charges.

2. for electricity to flow, the magnetic field on a location of a charge should be changing

hence for a magnet to produce a changing magnetic field at a point, the magnet must be in relative motion with the point

hence for a moving magnet, current will flow

3. in hydroelectric power plant

the energy is first stored in the Dam in the form of potential energy of water

then the water flows through the turbine converting potential energy in mechanical energy

this mechanical energy when transferred to a moving magnet creates electgrical energy form the dynamo

hence finally electrical energy is obtained

4. birds arent electrocuted when they sit on power line because when they sit, the resistance of the bird body is too high as compared to the direct wire joining the two feet of the bird

hence the current passes favourably through the wire instead of passing through the bird, saving it

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