   Chapter 19.8, Problem 19.5QQ

Chapter
Section
Textbook Problem

Which of the following actions would double the magnitude of the magnetic force per unit length between two parallel current-carrying wires? Choose all correct answers. (a) Double one of the currents. (b) Double the distance between them. (c) Reduce the distance between them by half. (d) Double both currents.

To determine
How to double the magnitude of the magnetic force per unit length between two parallel current carrying wires.

Explanation
The magnitude of magnetic force per unit length of two parallel current carrying wires is given by,

Fl=μ0I1I22πd (1)

• F is the magnitude of force
• l is the length of the wires
• μ0 is the permeability of free space
• I1 is the current in the first

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