5 - The Magnetic Field - MasteringPhysics Assignment Print...

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The Magnetic Field Due: 11:55pm on Monday, April 25, 2011 Note: You will receive no credit for late submissions. To learn more, read your instructor's Grading Policy [Switch to Standard Assignment View ] Ampère’s Law Explained Learning Goal: To understand Ampère’s law and its application. Ampère’s law is often written . Part A The integral on the left is ANSWER: Correct the integral throughout the chosen volume. the surface integral over the open surface. the surface integral over the closed surface bounded by the loop. the line integral along the closed loop. the line integral from start to finish. Part B What physical property does the symbol represent? The positive direction of the line integral and the positive direction for the current are related by the right-hand rule: Wrap your right-hand fingers around the closed path, then the direction of your fingers is the positive direction for and the direction of your thumb is the positive direction for the net current. Note also that the angle the current-carrying wire makes with the surface enclosed by the loop doesn't matter. (If the wire is at an angle, the normal component of the current is decreased, but the area of intersection of the wire and the surface is correspondingly increased.) ANSWER: Correct The current along the path in the same direction as the magnetic field The current in the path in the opposite direction from the magnetic field The total current passing through the loop in either direction The net current through the loop Part C The circle on the integral means that must be integrated ANSWER: Correct over a circle or a sphere. along any closed line that you choose. along the path of a closed physical conductor. over the surface bounded by the current-carrying wire. Part D Which of the following choices of path allow you to use Ampère’s law to find ? The path must pass through the point . The path must have enough symmetry so that is constant along large parts of it. The path must be a circle. ANSWER: [ Print ] Page 1 of 12 MasteringPhysics: Assignment Print View 4/25/2011 http://session.masteringphysics.com/myct/assignmentPrintView?assignmentID=1571104
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Correct a only a and b a and c b and c Part E Ampère’s law can be used to find the magnetic field around a straight current-carrying wire. Is this statement true or false? In fact Ampère's law can be used to find the magnetic field inside a cylindrical conductor (i.e., at a radius less than the radius of the wire, ). In this case is just that current inside , not the current inside (which is the total current in the wire). ANSWER: Correct true false Part F Ampère’s law can be used to find the magnetic field at the center of a square loop carrying a constant current. Is this statement true or false?
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