1. a. A long horizontal wire carries 16.2 A of current due north. What is the magnitude of the net magnetic field 24.9 cm due west of the wire if the Earth's field there points downward, 39.0 below the horizontal, and has magnitude 4.91E-5 T?

b. Calculate the angle relative to the horizontal with up as the positive direction.

2. a. Determine the magnitude of the magnetic field midway between two long straight wires 2.70 cm apart when one wire carries 4.90 A and the other carries 14.2 A. Assume these currents are in the same direction.

b. Determine the magnitude of the magnetic field when these currents are in opposite directions.

3. A vertical straight wire carrying an upward 13.4 A current exerts an attractive force per unit length of 9.40E-4 N/m on a second parallel wire 5.80 cm away. What is the magnitude of the current that flows in the second wire?

4. a. A long horizontal wire carries a current of I_T = 49.2 A. A second wire (I), made of 2.70 mm diameter copper wire and parallel to the first but L = 12.8 cm below it, is held in suspension magnetically, as seen in the figure below. What is the current in the lower wire (Use right as the positive direction)?

Transcribed Image Text:

IT |=? IT |=?