Physics
Physics
7th Edition
ISBN: 9780321929013
Author: Douglas C. Giancoli
Publisher: PEARSON
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Chapter 20, Problem 1OQ

Part (a)

To determine

Force experienced by electric charge at rest when placed in a magnetic field of a magnet.

Solution: Electric charge at rest will not experience any force.

Part (a)

Expert Solution
Check Mark

Explanation of Solution

Static Electric charge will not experience any force because according to the Lorentz relation F=qvBSinα , ( α is the angle between direction of velocity and direction of magnetic field); if v=0 then F=0 so it will not experience any force.

Conclusion: An external magnetic field always exerts force of other magnets and charge particles.

Part (b)

To determine

To determine: - Force experienced by moving electric charge when placed in magnetic field of a magnet.

Part (b)

Expert Solution
Check Mark

Answer to Problem 1OQ

Solution: - Moving electric charge may or may not experience a force.

Explanation of Solution

Explanation: - Dynamic Electric charge will not experience a force if its direction is parallel or anti-parallel to the direction of magnetic field. And with respect to any other direction it will experience a force.

According to Lorentz relation, F=qvBSinα

For parallel ( α=0 ) , anti-parallel ( α=180 ) Sinα=0

So, F=0 .

Conclusion: - An external magnetic field always a force on other magnets and charge particles.

Part (c)

To determine

To Determine: - Force experienced by electric current in a wire when placed in magnetic field.

Part (c)

Expert Solution
Check Mark

Answer to Problem 1OQ

Solution: - Electric current in a wire will experience a force.

Explanation of Solution

Explanation: - Electric current in a wire will experience a force because current is only due to moving charges and magnetic field always exerts a force on moving charges so, conductor will also experience a force.

Conclusion: - Every conductor experiences a force given by a relation F=ilBSinθ .

Part (d)

To determine

To Determine: - Force experienced by another magnet when placed in magnetic field of a magnet.

Part (d)

Expert Solution
Check Mark

Answer to Problem 1OQ

Solution: - Another magnet will experience a force.

Explanation of Solution

Explanation: - Another magnet always experiences a force because it is a natural property of a magnet, but this force can be repulsive or attractive depending on the nature of poles of a magnet.

Conclusion: - Magnetic force between the magnets is inversely proportional to the distance between them.

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Chapter 20 Solutions

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