Mastering Physics Solutions: Exercise 19.38

Mastering Physics Solutions: Exercise 19.38

On May 10, 2012, in Chapter 19: Magnetism, by Mastering Physics Solutions

Exercise 19.38

Part A = 0 T
Part B = 4.0*10^-6 Click to use the calculator/solver for this part of the problem

Solutions Below:

Two long, parallel wires separated by 60 cm each carry currents of 3.0 A in a horizontal direction.

Part A

Find the magnetic field midway between the wires if the currents are in the same direction.
Express your answer using two significant figures.

Since the currents are in opposite directions, the magnetic field between the wires is canceled out and is zero. Just use the right hand rule.

0 T

Part B

Find if they are in opposite directions.
Express your answer using two significant figures.

The magnetic field from each wire is:

B = μ0 * i / (2πr)

μ0 is the magnetic constant and = 1.2566 * 10^-6 m * kg / s2

B = 1.2566 * 10^-6 * 3.0 / (2 * 3.14159 * 0.30)
B = 2.0 * 10^-6

Since there are two wires, multiply the field from each wire by 2:

4.0*10^-6

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