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Chapter 7: Q. 26 (page 178)

FIGURE P7.26shows two strong magnets on opposite sides of a small table. The long-range attractive force between the magnets keeps the lower magnet in place.

a. Draw an interaction diagram and draw free-body diagrams for both magnets and the table. Use dashed lines to connect the members of an action/reaction pair.

b. The lower magnet is being pulled upward against the bottom of the table. Suppose that each magnet’s weight is 2.0Nand that the magnetic force of the lower magnet on the upper magnet is 6.0N. How hard does the lower magnet push against the table?

Short Answer

Expert verified

(a) Interaction diagram and free-body diagram has been drawn

(b) The lower magnet is pushed against the table by 4N.

Step by step solution

01

Given information (part a)

Weight of the magnet,W=2N

Force of the magnet,F=6N

02

Explanation (part a)

The free-body diagram

03

Given information (part b)

Weight of the magnet, W=2N

Force of the magnet,F=6N

04

Explanation (part b)

Since the lower magnet is in equilibrium, therefore, the force by which the magnet is pushed against the table can be calculated by the equilibrium of forces.Netupward force on lower magnet can be calculated as follows.

Fpull=6N-2N=4N

This is the force which will act on table.

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