Homework Problem 9.11 A region of space contains a changing magnetic field. What

Question

Homework Problem 9.11 A region of space contains a changing magnetic field. What can be deduced from this observation? Select One of the Following (a) There is a static electric charge in the region (b) There is permanent magnetic material in the region (c) There is a current flowing through the region. (d) There an electric field in the region. Homework Problem 9.12 The figure to the right shows a mag- netic field pointing out of the page whose magnitude is decreasing with time. A conducting ring is in the field as represented by the thick black circk. What is the direction of the magnetic field through the gray surface produced by the induced current in the conducting ring? conducting ring Decreasing Magnetic Field Select One of the Following (a) into the page (b) out of the page (c) clockwise (d) counterclockwise

Explanation / Answer

1. Changing magnetic field induces electric current in the system. (c)

2. The direction will be counter clockwise. It can be found using the right hand thumb rule. The thumb points outside and the fingers curl to give the direction of the magnetic field. (d)

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