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Problems_3-5-2010

# Problems_3-5-2010 - Problem 1 A conducting rod of length L...

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Problem 1 A conducting rod of length L is being pulled to the right along a set of frictionless conducting rails. An external force pulls the rod along at a constant speed v. The rod and rails sit in a uniform magnetic field B that points everywhere out of the page. The rails and rod form a closed electrical circuit with a resistor whose value is R. Derive an expression for the power dissipated in the resistor in terms of v, R, L, and B. Use RHR 1 and the concept of motional emf to show that a magnetic force is opposing the motion of the rod. B Rod R v L

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Problem 2 – A conducting rod is free to slide without friction on two conducting rails. The rod is initially at rest. Describe its motion once the switch is closed.
Problem 3 A long piece of flexible conducting wire is bent into a loop and placed into a uniform magnetic field that is directed everywhere into the page as shown. Someone then grabs both ends of the wire and pulls them taught so that the loop gets smaller and smaller. As the loop shrinks, will there be an induced current that flows around the loop,

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