- #1

superslow991

- 78

- 1

## Homework Statement

Two circular coils of diameter 30.0 cm are parallel to each other and have their centers along the same line

*L*but separated by 22.0 cm. When an experimenter views the coils along

*L*, the coil closer to her carries a clockwise current of 2.50 A. Find the magnitude and sense (clockwise or counterclockwise) of the current needed in the other coil so that the net magnetic field on

*L*midway between the two coils will have a magnitude of 4.10 µT and point away from the experimenter who is viewing the coils along

*L*. (

*μ*0 = 4

*π*× 10-7 T ∙ m/A)

## Homework Equations

B1 = μo I r2 / [ 2 (r2 + x2 ) 3/2 ]

i2 = i1*(B2/B1)

## The Attempt at a Solution

Trying to figure out the direction of the coils, field, and current. I believe the magnetic field is in direction of the current? the current is in direction of the length?