Two identical charges, each 7.6×10-5 C are separated by 0.11 m

1.)Two identical charges, each 7.6×10-5 C are separated by 0.11 m. 

a) What is the force of one charge on the other?

b) Is this force an attractive or repulsive force?

2.)A power of 100 kW is delivered a long distance by a pair of power lines, between which the voltage is 15,000 V. 

a) What is the current in the line?

b) If each of the two lines has a resistance of 15 Ω, what is the change of voltage along each line? 

a) Find the total resistance of the circuit.

b) Find the current in the circuit.

c) What is the voltage drop across each resistor?

4.)The primary (input) coil of a transformer connected to 240 V has 125 turns. The secondary (output) coil has 10 turns. What is the secondary (output) voltage?

5.)The average distance from the earth to the sun is 150 x109 meters. What is the required time for sunlight to reach the earth?

You will have five questions to answer. The questions are real-life applications in which physics are used. Do your best. Be sure to show your work, as partial credit will be given. Also, don’t forget to use “units”. For full credit the correct unit must be reflected.

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