Assignment 09

# Assignment 09 - Class PEP112S2007 Assignment 9 Assignment...

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Class PEP112S2007 Assignment 9 Assignment is due at 11:00pm on Sunday, April 1, 2007 Credit for problems submitted late will decrease to 0% over the course of 10 hour(s) after the deadline has passed. The wrong answer penalty is 1% per part. Multiple choice questions are penalized as described in the online help. The unopened hint bonus is 1% per part. You are allowed 10 attempts per answer. Reading Quiz 32.2 Part A What is the shape of the trajectory that a charged particle follows in a uniform magnetic field? ANSWER: A helix A parabola A circle An ellipse A hyperbola Problem 32.42 A small bar magnet experiences a 2.30×10 - 2 torque when the axis of the magnet is at to a 7.00×10 - 2 magnetic field. Part A What is the magnitude of its magnetic dipole moment? ANSWER: 0.465 Problem 32.17

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The on-axis magnetic field strength 12.0 from a small bar magnet is 4.80 . Part A What is the bar magnet's magnetic dipole moment? ANSWER: 4.15×10 - 2 Part B What will be the magnetic field strength if the bar magnet is rotated end-over-end by ? ANSWER: 4.80×10 - 6 T Magnetic Force on a Current-Carrying Wire Learning Goal: To understand the magnetic force on a straight current-carrying wire in a uniform magnetic field. Magnetic fields exert forces on moving charged particles, whether those charges are moving independently or are confined to a current-carrying wire. The magnetic force on an individual moving charged particle depends on its velocity and charge . In the case of a current-carrying wire, many charged particles are simultaneously in motion, so the magnetic force depends on the total current and the length of the wire . The size of the magnetic force on a straight wire of length carrying current in a uniform magnetic field with strength is . Here is the angle between the direction of the current (along the wire) and the direction of the magnetic field. Hence refers to the component of the magnetic field that is perpendicular to the wire, . Thus this equation can also be written as . The direction of the magnetic force on the wire can be described using a "right-hand rule." This will be
Part A Consider a wire of length = 0.300 that runs north-south on a horizontal surface. There is a current of = 0.500 flowing north in the wire. (The rest of the circuit, which actually delivers this current, is not shown.) The Earth's magnetic field at this location has a magnitude of 0.50 (or, in SI units, ) and points north and 38 degrees down from the horizontal, toward the ground. What is the size of the magnetic force on the wire due to the Earth's magnetic field? In considering the agreement of units, recall that . Express your answer in newtons to two significant figures. ANSWER:

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Assignment 09 - Class PEP112S2007 Assignment 9 Assignment...

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