HOMEWORK FOR LAB 10 ELECTROMAGNETISM 1. In the diagram on the right, a wire is c

Question

HOMEWORK FOR LAB 10 ELECTROMAGNETISM 1. In the diagram on the right, a wire is car- a cureent. The magnetic field above wire is into the paper and the mag netic field below the wire is out of the as shown. (An x indicates a field and a. indicates a field line out of the paper) What is the direc- tion of current flow in the wirne? Explain your answer based on your observations this lab and the right hand rule 2 Is the magnetic field magnitude larger at point 1 or point 2? Explain based on your observations in this lab. 3. You have a rod-shaped magnet and also a coil of wire connected to a volt- meter. Under which of the following cireumstances will there be a voltage induced across the coil? If you predict that a voltage is induced, explain why. If you think there will be no voltage, explain why not. a. The magnet is sitting near the coil, and the coil is rotated so that its face is no longer perpendicular to the magnet b. The magnet is sitting near the coil, and the coil is moved quickly away from the magnet The magnet is sitting at rest with its North pole in the middle of the coil. · d. The magnet is siting with its North pole in the middle of the coal and is pulled away from the coil. LAB 10: ELECTROMAGNET?SM 211

Explanation / Answer

a) Using the right hand rule, Grab the wire and curl the fingers in the direction of magnetic field ( keeping track of given notation of magnetic field direction), the current in the wire is to the left.

b) As B = uoI / 2*pi*r

so greater the distance from wire, weaker will be the magnetic field. So, field is stronger at point 1.

c) the action of moving a coil or loop of wire through a magnetic field induces a voltage in the coil. A constant magnetic field won't induce any voltage. However, if we move a magnet back and forth near a coil, it will induce a voltage

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