Week8Concepts.pdf - ConcepTest 29.4 Shrinking Wire Loop If a coil is shrinking in a magnetic field pointing into the page in what direction ConcepTest

# Week8Concepts.pdf - ConcepTest 29.4 Shrinking Wire Loop If...

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1 Page 1 1) clockwise 2) counterclockwise 3) no induced current If a coil is shrinking in a magnetic field pointing into the page, in what direction is the induced current? ConcepTest 29.4 Shrinking Wire Loop The magnetic flux through the loop is decreasing , so the induced B field must try to reinforce it and therefore points in the same direction into the page . According to the right-hand rule, an induced clockwise current will generate a magnetic field into the page . 1) clockwise 2) counterclockwise 3) no induced current If a coil is shrinking in a magnetic field pointing into the page, in what direction is the induced current? ConcepTest 29.4 Shrinking Wire Loop Follow - up: What if the B field is oriented at 90 ° to its present direction? N S N S 1) V 1 > V 2 2) V 1 < V 2 3) V 1 = V 2 ¹ 0 4) V 1 = V 2 = 0 Wire #1 (length L ) forms a one - turn loop , and a bar magnet is dropped through. Wire #2 (length 2 L ) forms a two - turn loop , and the same magnet is dropped through.

• Spring '14
• Homan,D

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