asn07_2023Physics XXXXXXXXXX)Assignment 7Due: Thursday, March 23Hand in to drop slots on second floor of Dunn. Answer in the spaces provided. Your name (print: Last, First) Your Mark (out...

Do all three questions


asn07_2023 Physics 1551 (2023) Assignment 7 Due: Thursday, March 23 Hand in to drop slots on second floor of Dunn. Answer in the spaces provided. Your name (print: Last, First) Your Mark (out of 18) 1. Forces between wires. (Chapter 26, exercise 33) In standard household wiring, parallel wires about 1 cm apart carry currents of about 15 A. What is the force per unit length between these wires? [5] 2. Spiralling electron. In 2.0 s an electron moves 15.0 cm in the direction of a 0.10 T magnetic field. If the electron's velocity components perpendicular and parallel to the field are equal, (a) what is the length of its actual spiral trajectory [2], and (b) how many orbits about the field direction does it complete? [3] Hint: from the velocity components find the speed, and thus the length of the spiral. 3. Pipes. Consider a long, hollow conducting pipe of radius R and length L. (a) A uniform current flows along the pipe, as shown. Use Ampère's law to find the magnetic field strength (i) inside and (ii) outside the pipe. [4] (b) The same pipe now carries a current I around the pipe. Again find expressions for the magnetic field (i) inside and (ii) outside the pipe. Hint: what configuration does this resemble? [4]