Q71PP In part (a) of the figure, a cur... [FREE SOLUTION]

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University Physics with Modern Physics

Hugh D. Young, Roger A. Freedman

Physics

14th edition Edition 路 1596 pages

ISBN: 9780321973610

Chapter 4: Q71PP (page 988)

In part (a) of the figure, a current pulse increases to a peak and then decreases to zero in the direction shown in the stimulating coil. What will be the direction of the induced current (dashed line) in the brain tissue? (a) 1; (b) 2; (c) 1 while the current increases in the stimulating coil, 2 while the current decreases;
(d) 2 while the current increases in the stimulating coil, 1 while the current decreases

Short Answer

Expert verified

The right choice is option C

Step by step solution

Important Concepts

Right-hand rule for a magnetic field around a current-carrying wire: Point your thumb of your right hand in the direction of the current. Your fingers now curl, around the wire in the direction of the magnetic field lines.

Right-hand rule for a magnetic field produced by a current in a loop;

When the fingers of your right hand curl in the direction of the current, your right thumb points in the direction of the magnetic field lines.

Application

Applying the right-hand rule to the simulating coil, the direction of the magnetic field produced by the current in the coil is upward.

鈥� When the current in the simulating coil is increasing, the magnetic field in the brain is increasing upward. Applying Lenz's law, the change in the magnetic field causes an induced current to oppose this change. So, the current must produce a magnetic field directed downward, this magnetic field is produced by a current flowing clockwise.

鈥� When the current is decreasing, the magnetic field in the brain is decreasing. So, by Lenz's law, the current in the brain must flow counter clockwise to produce an upward magnetic field to oppose the change in the simulating loop.

Therefore, the right choice is c.