Question 21-23

Summary: Q21. Explain why no resistance is required when a large d.c. motor is running at high speed, but a substantial resistance is needed when the motor is starting up. Q22. Identify the direction of the force that exists between two parallel wires, each with a current flowing in the same direction along the wires. On a set of axes, sketch a graph that shows how the force between the two wires would vary if the length of the shorter wire were increased. Explain how these results demonstrate the moto-effect. Q23. Discuss the effects of the development of electrical generators on society and the environment. Outline the methods of X-ray diffraction used by the Braggs to determine the structure of crystals.

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Section I Question 10 - 2002 HSC Section I Question 22 - 2002 HSC Section I Question 23 - 2002 HSC Section I Question 27 - 2002 HSC Section I Question 6 - 2002 HSC Section I Question 7 - 2002 HSC Section I Question 8 - 2002 HSC Section I Question 9 - 2002 HSC Written Paper Section I Question 10 - 2001 HSC Written Paper Section I Question 11 - 2001 HSC Written Paper Section I Question 14 - 2001 HSC Written Paper Section I Question 4 - 2001 HSC Written Paper Section I Question 8 - 2001 HSC

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